Resuggestion of https://backpack.tf/suggestion/5b28dfc144325a5c19615b48

New price: 9-10 keys

Proof:

Sale #1 (1 month)= 9 keys

https://backpack.tf/profiles/76561198368937729#!/compare/1526774400/1527033600

Sold for 9 keys.

Sale #2 (2 months)= 13 keys

https://backpack.tf/profiles/76561198139190812#!/compare/1525132800/1525219200

Sold for 13 keys 2.44 ref. Rounding to 13.

Sale #3 (2 months)= 9 keys

https://backpack.tf/profiles/76561198186096191#!/compare/1525132800/1525219200

Sold for 9 keys.

Sale #4 (1 week)= 9 keys

https://backpack.tf/profiles/76561198074625962#!/compare/1528675200/1528761600

Sold for 9 keys.

Sale #5 (1 week)= 9 keys

https://backpack.tf/profiles/76561198362185176#!/compare/1528588800/1528675200

Sold for 8 keys 17 ref. Rounding to 9.

Sale #6 (fresh)= invalid

https://backpack.tf/profiles/76561198156523816#!/compare/1529020800/1529107200

Bulk.

Sale #7 (1 week)= 10 keys

https://backpack.tf/profiles/76561198363114934#!/compare/1528761600/1528848000

Sold for a smoking oiled baker boy (10). Mini below.

Sale #8 (3 weeks)= 12 keys

https://backpack.tf/profiles/76561198093765664#!/compare/1527638400/1527724800

Sold for a bubbling conquistador (10) + 2 keys = 12 keys.

Sale #9 (3 weeks)= invalid

https://backpack.tf/profiles/76561198344316001#!/compare/1527292800/1527379200

Sold for a holy grail fubar fanfare. Better used there.

Sale #10 (2 weeks)= 9 keys

https://backpack.tf/profiles/76561198367864158#!/compare/1528070400/1528243200

Sold for 9 keys.

Sale #11 (3 weeks)= 10 keys

https://backpack.tf/profiles/76561198024925599#!/compare/1527638400/1527724800

Sold for a tesla coil wing mann (10). Mini below.

Sale #12 (1 week)= invalid

https://backpack.tf/profiles/76561198322876605#!/compare/1528416000/1528502400

Bulk.

Sale #13 (3 weeks)= 9 keys

https://backpack.tf/profiles/76561198194192453#!/compare/1527552000/1527811200

Sold for 9 keys 7 ref. Rounding to 9.

Sale #14 (1 week)= 12 keys

https://marketplace.tf/items/30809;5;u110

Sold for 22.85$. Keys were 1.94$. 22.85 / 1.94 = ~12 keys

Sale #15 (1 week)= 12 keys

https://marketplace.tf/items/30809;5;u110

Sold for 22.89$. Keys were 1.94$. 22.89 / 1.94 = ~12 keys

Sale #16 (1 week)= 12 keys

https://marketplace.tf/items/30809;5;u110

Sold for 22.90$. Keys were 1.95$. 22.90 / 1.95 = ~12 keys

Sale #17 (2 week)= 12 keys

https://marketplace.tf/items/30809;5;u110

Sold for 22.98$. Keys were 1.97$. 22.98 / 1.97 = ~12 keys

https://backpack.tf/profiles/76561198120672630#!/compare/1528761600/1528848000

https://backpack.tf/profiles/76561198091502579#!/compare/1528761600/1528848000

Bought one for 9 keys.

Credits to Erik.

https://gyazo.com/37c09af93404364a25dd19a8b5761d04

https://bot.tf/stats/item?def=30809&q=5&ef=Starstorm+Slumber&craft=1&aus=0&ks=0

Bot.tf page also shows nearly 50 sales combined that are at 9-10 key range.

Credits to Erik.

Sellers & buyers very close together:

https://imgur.com/a/yNkurXr

_________________________________________________________

Minis

smoking oiled baker boy:

https://backpack.tf/profiles/76561198083134207#!/compare/1529020800/1529107200

Sold for 10 keys.

Going with 10 keys.

tesla coil wing mann:

https://backpack.tf/profiles/76561198202135278#!/compare/1527379200/1527465600

Sold for 10 keys.

https://backpack.tf/profiles/76561198290292570#!/compare/1529107200/1529193600

Sold for voltaic head full of hot air (10).

Going with 10.

_________________________________________________________

SUMMARY

Sales:

9 x7

10 x2

12 x5

13

12 and 13 are outliers.

Buyer at 9, but there are so many sales at 9 + sellers and buyers are so close together, that i'll include 9.

Going with 9-10 keys.

Feel free to add proof to support or counter my new price.