The joke is the price of this hat.

Sale 1:

https://backpack.tf/profiles/76561198037263729#!/compare/1570406400/1570579200

https://backpack.tf/profiles/76561198078999373#!/compare/1570492800/1570579200

Sold for 22 keys

sale 2:

https://backpack.tf/profiles/76561198078999373#!/compare/1570665600/1570752000

https://backpack.tf/profiles/76561198177569915#!/compare/1570665600/1570752000

Sold for P Fetti Bandana + max head(~19) + 1 key

nothing solid on Bandana

https://pastebin.com/HyGHxPuB

Sale 3:

https://backpack.tf/profiles/76561198177569915#!/compare/1572652800/1572739200

https://backpack.tf/profiles/76561198128784673#!/compare/1572739200/1572825600

sold with Steaming Samur-Eye + ~18 keys in sweets for Vortex Field

use there

Sale 4:

https://backpack.tf/profiles/76561198131983415#!/compare/1573084800/1573171200

https://backpack.tf/profiles/76561198127045035#!/compare/1573084800/1573171200

Sold with Open Polar for Blizzardy Mining(43) + SGG Rhythm + ~4 keys in sweets

Rhythm Mini:

https://backpack.tf/suggestion/5dd745add38172420a3eedf9

suggestion for 4.5 keys

Bear Mini:

https://backpack.tf/suggestion/5dd746456780725d625ff9a3

Suggestion for 13 keys

Total is 38.5 keys

Sale 5:

https://backpack.tf/profiles/76561198127045035#!/compare/1573084800/1573171200

https://backpack.tf/profiles/76561198389129235#!/compare/1573084800/1573171200

Sold for KaW Neckwear

Neck Mini:

https://backpack.tf/suggestion/5dd635a2d38172077b62b465

Suggestion for 18.5 keys

Sale 6:

https://backpack.tf/profiles/76561198389129235#!/compare/1573084800/1573171200

https://backpack.tf/profiles/76561198070823302#!/compare/1573084800/1573171200

Sold for Vortex Vizier + ~11 keys in sweets

use there, ends up very high here.

sale 7:

https://backpack.tf/profiles/76561198070823302#!/compare/1573171200/1573257600

https://backpack.tf/profiles/76561198063640894#!/compare/1573171200/1573257600

Sold with 6 keys for DBD Gibus

use there

Sale 8:

https://backpack.tf/profiles/76561198064856380#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198089253101#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198068356593#!/compare/1571961600/1572048000

https://backpack.tf/profiles/76561198068356593#!/compare/1572134400/1572220800

https://backpack.tf/profiles/76561198950621219#!/compare/1572134400/1572220800

https://backpack.tf/profiles/76561198119153879#!/compare/1572220800/1572307200

https://backpack.tf/profiles/76561198101300189#!/compare/1572393600/1572480000

https://backpack.tf/profiles/76561198027378787#!/compare/1572307200/1572393600

https://backpack.tf/profiles/76561198119153879#!/compare/1572307200/1572393600

https://backpack.tf/profiles/76561198950621219#!/compare/1572393600/1572480000

Gambling / bulk

sale 9:

https://marketplace.tf/items/tf2/30406;5;u18

$30 / $1.80 = 16.67 keys

Total sales @:

16.67, 18.5, 22, 38.5 keys

buyer at 15 keys,

taking 17 - 22 keys.