Counter.

Sold for 29 Keys

http://backpack.tf/profiles/76561198009950989#!/compare/1465344000/1465430400

Sold for 22 Keys, Outlier

http://backpack.tf/profiles/76561198004727019#!/compare/1469836800/1470441600

Sold for a Cloud 9 Belgian Detective(28 Keys)

http://backpack.tf/profiles/76561198171148947#!/compare/1470528000/1470787200

Sold for 27 Keys

http://backpack.tf/profiles/76561198091632624#!/compare/1463961600/1464048000

Sold for an Australium Flame Thrower(16 Keys) and 11 Keys(27 Keys total)

http://backpack.tf/profiles/76561198200038513#!/compare/1467676800/1467849600

22 looks really low with all these sales at higher, most of them being pure too.

27-29 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.