Meh.

Sale 1

http://www.tf2outpost.com/trade/25962583 - Sold for a Frostbite Titanium Tyrolean (20*0.9 = 18 keys) (Outlier)

Sale 2

http://www.tf2outpost.com/trade/25918983 - Sold with a Collector's Specialized Killstreak Escape Plan (5 keys) for a Death at Dusk Fruit Shoot (38*0.9 - 5 = 29 keys)

Sale 3

http://www.tf2outpost.com/trade/26065865 - Sold for a Scorching Flames Bombing Run but BO of 30 keys

Sale 4

http://www.tf2outpost.com/trade/25774492 - Sold for a Duped Max (27*0.9 = 24 keys)

Feel free to counter / support my proofs