Resuggestion, thanks to Mindacos & Xerogyf for the info!

Old MacDonald's son joined the army. He is now E.I. G.I. Joe.

Taking last 2 months

Sale 1:

https://backpack.tf/profiles/76561198069493147#!/compare/1574467200/1574553600

https://backpack.tf/profiles/76561198080179568#!/compare/1574467200/1574553600

Sold for 9 keys

sale 2:

https://backpack.tf/profiles/76561198095407289#!/compare/1569801600/1569888000

https://backpack.tf/profiles/76561198300074730#!/compare/1569801600/1569974400

Bulk

sale 3:

https://backpack.tf/profiles/76561198300074730#!/compare/1570233600/1570752000

https://backpack.tf/profiles/76561198098330939#!/compare/1570752000/1570838400

Bulk

sale 4:

https://backpack.tf/profiles/76561198340064145#!/compare/1572393600/1572480000

https://backpack.tf/profiles/76561198253005381#!/compare/1572220800/1572307200

https://backpack.tf/profiles/76561198340064145#!/compare/1572393600/1572480000

tradeback

sale 5:

https://backpack.tf/profiles/76561198340064145#!/compare/1572393600/1572480000

https://backpack.tf/profiles/76561198408606810#!/compare/1572393600/1572480000

Sold for ~8 keys

sale 6:

https://backpack.tf/profiles/76561198408606810#!/compare/1572912000/1572998400

https://backpack.tf/profiles/76561198054609705#!/compare/1572912000/1572998400

Sold for ~6.5 keys

sale 7:

https://backpack.tf/profiles/76561198069643190#!/compare/1569456000/1570752000

https://backpack.tf/profiles/76561198342161127#!/compare/1569456000/1569628800

SCM

sale 8:

https://backpack.tf/profiles/76561198332787368#!/compare/1570665600/1571875200

https://backpack.tf/profiles/76561198431421139#!/compare/1571356800/1571529600

Keys

Sale 9:

https://backpack.tf/profiles/76561198431421139#!/compare/1571616000/1571702400

https://backpack.tf/profiles/76561198076854327#!/compare/1572393600/1572480000

Untrace

sale 10:

https://backpack.tf/profiles/76561198036445124#!/compare/1573257600/1573430400

'https://backpack.tf/profiles/76561198335791307#!/compare/1573344000/1573430400

Sold for ~8 keys (QS)

sale 11:

https://backpack.tf/profiles/76561198255758202#!/compare/1569888000/1570233600

https://backpack.tf/profiles/76561198917893533#!/compare/1570147200/1570233600

Sold for 7 keys

Sale 12:

https://backpack.tf/profiles/76561198917893533#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198215130228#!/compare/1570147200/1570233600

Bulk

sale 13:

https://backpack.tf/profiles/76561198215130228#!/compare/1570147200/1570233600

https://backpack.tf/profiles/76561198061890230#!/compare/1570147200/1570233600

Sold for ~8 keys

sAle 14:

https://backpack.tf/profiles/76561198061890230#!/compare/1570406400/1570492800

https://backpack.tf/profiles/76561198152654542#!/compare/1570406400/1570492800

Bulk

sale 15:

https://backpack.tf/profiles/76561198155377359#!/compare/1571184000/1571270400

https://backpack.tf/profiles/76561198928347702#!/compare/1571184000/1571270400

QS

sale 16:

https://backpack.tf/profiles/76561198928347702#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198837403856#!/compare/1571961600/1572048000

Sold for 9 keys

sale 17:

https://backpack.tf/profiles/76561198837403856#!/compare/1572048000/1572134400

https://backpack.tf/profiles/76561198841279602#!/compare/1572134400/1572220800

QS

sale 18:

https://backpack.tf/profiles/76561198841279602#!/compare/1572480000/1572566400

https://backpack.tf/profiles/76561198134220286#!/compare/1572480000/1572566400

Sold for 8 keys

sale 19:

https://backpack.tf/profiles/76561198097866730#!/compare/1571443200/1572048000

https://backpack.tf/profiles/76561198880384227#!/compare/1571184000/1571788800

Bulk

Sale 20:

https://backpack.tf/profiles/76561198109061043#!/compare/1574208000/1574294400

https://backpack.tf/profiles/76561198080179568#!/compare/1574121600/1574208000

QS

sale 21:

https://backpack.tf/profiles/76561198080179568#!/compare/1574121600/1574208000

https://backpack.tf/profiles/76561198302774496#!/compare/1574208000/1574294400

Keys

Sale 22:

https://backpack.tf/profiles/76561198056804742#!/compare/1571443200/1571529600

https://backpack.tf/profiles/76561198335791307#!/compare/1571356800/1571443200

QS for ~8 keys

sale 23:

https://backpack.tf/profiles/76561198335791307#!/compare/1571875200/1571961600

https://backpack.tf/profiles/76561198833954279#!/compare/1571788800/1571961600

https://backpack.tf/profiles/76561198335791307#!/compare/1571875200/1571961600

tradeback

sale 24:

https://backpack.tf/profiles/76561198335791307#!/compare/1573171200/1573257600

https://backpack.tf/profiles/76561198138278404#!/compare/1573171200/1573257600

Keys

sale 25:

https://backpack.tf/profiles/76561198138278404#!/compare/1573862400/1573948800

https://backpack.tf/profiles/76561198129496130#!/compare/1573862400/1573948800

Untrace

sale 26:

https://backpack.tf/profiles/76561198129496130#!/compare/1573862400/1573948800

https://backpack.tf/profiles/76561198330335066#!/compare/1573948800/1574035200

Sold for Blizzardy Rimmed + ~2 keys in sweets

use there

https://bot.tf/stats/listings/4ZKDQN0D

B/O of ~9.5 keys

sale 27:

https://backpack.tf/profiles/76561198330335066#!/compare/1574035200/1574121600

https://backpack.tf/profiles/76561198130403117#!/compare/1574035200/1574121600

Sold for ~8.5 keys in sweets

https://bot.tf/stats/listings/425EQZKG

B/O of 9 keys

sale 28:

https://backpack.tf/profiles/76561198127121102#!/compare/1572480000/1573084800

https://backpack.tf/profiles/76561198363395191#!/compare/1572998400/1573084800

QS

sale 29:

https://backpack.tf/profiles/76561198363395191#!/compare/1573257600/1573344000

https://backpack.tf/profiles/76561198074625962#!/compare/1573257600/1573430400

Keys

sale 30:

https://backpack.tf/profiles/76561198287142052#!/compare/1570838400/1572912000

https://backpack.tf/profiles/76561198838447026#!/compare/1572652800/1572739200

QS for ~7.5 keys

sale 31:

https://backpack.tf/profiles/76561198838447026#!/compare/1572652800/1572739200

https://backpack.tf/profiles/76561198838447026#!/compare/1572652800/1572739200

Can trace 4 keys

sale 32:

https://backpack.tf/profiles/76561198351091430#!/compare/1573948800/1574553600

https://backpack.tf/profiles/76561198841279602#!/compare/1574467200/1574553600

QS

sale 33:

https://marketplace.tf/items/tf2/30809;5;u108

$20.99 / $1.82 = 11.53 keys

$20.99 / $1.83 = 11.47 keys

$20 / $1.81 = 11.05 keys

$20 / $1.78 = 11.24 keys

$20 / $1.79 = 11.17 keys <--- https://backpack.tf/item/6074368075

$15.7 / $1.79 = 8.77 keys <--- https://backpack.tf/item/5244704748

$20 / $1.80 = 11.11 keys

$15.7 / $1.80 = 8.72 keys

$20 / $1.76 = 11.36 keys <--- https://backpack.tf/item/5208422450 | https://bot.tf/stats/listings/4KR8KN5E B/O of ~10 keys, capping

Bot.tf:

https://bot.tf/stats/item?def=30809&q=5&ef=Tesla%20Coil&craft=1&aus=0&ks=0&source=browser_script

1 sale @ ~9.5 keys,

5 sales @ 9 keys,

1 sale @ ~8.5 keys,

8 sales @ ~8 keys,

1 sale @ ~7.5 keys,

Total sales @:

6.5

7

7.5 (x2)

8 (x13)

8.5 (x3)

9 (x8)

9.5

10

11 (x4)

11.5 (x2)

buyers up to ~7.5 keys,

seller at 9 keys, new,

seller at 9.5 is also new,

other seller at 9.5 is unsold for ~2 weeks:

https://bot.tf/stats/listings/4RGR3OG9

seller at 10 keys unsold for months:

https://bot.tf/stats/listings/M17NQLW1

calling 11 high,

7.5 low,

Xerogyf's Part:

Why is 10 in the range when there’s only 1 sale and the seller at 10 has been unsold for months? 24/34 sales are 8-9, the range should be that

Mindacos' Part:

Normally i'd argue that 10 or 9.5 Keys support the higher sales at 11-11.5 which also seem to be frequent to an extent, but given the lack of sales at both 9.5 and 10, and the fact that even the sellers speak up against including anything higher, I have to agree with this.

8-9 Keys feels like it's way more appropiate for this given the large sales numbers.