Meh.

Sale 1

http://www.tf2outpost.com/trade/25652274 - Sold for a Strange Killstreak Frying Pan (7 keys) + Strange Specialized Killstreak Shotgun (1.5 keys) + Strange Killstreak Festive Shotgun (3 keys) + Strange Festive Revolver (0.5 keys) (12*0.9 = 11 keys)

Sale 2

Before: http://backpack.tf/profiles/76561198160062501?time=1427353200

After: http://backpack.tf/profiles/76561198160062501?time=1427500133

- Sold for a Professional Killstreak Festive Rocket Launcher (15 keys) + 6 keys in items (21*0.9 = 19 keys) (Outlier)

Sale 3

Before: http://backpack.tf/profiles/76561198089899772?time=1427155499

After: http://backpack.tf/profiles/76561198089899772?time=1427180400

- Sold for a Vintage Professional Killstreak Lugermorph (10 keys) (10*0.9 = 9 keys)

Sale 4

http://www.tf2outpost.com/trade/25427549 - Sold for an Orbiting Fire Pugilist's Protector (14*0.9 = 13 keys)

Mini for the Orbiting Fire Pugilist's Protector

http://backpack.tf/vote/id/55425464b88d88a8498b4567

Feel free to counter / support my proofs