Meh.

Sale 1

http://www.tf2outpost.com/trade/26369218 - Sold with a Midnight Whirlwind Taunt: Oblooterated (25 keys) + Strange Specialized Killstreak Festive Minigun (9 keys) + Strange Festive Huntsman (5 keys) + 15 keys for an Aces High Killer Exclusive (70 - 39*0.9 - 15 = 20 keys) (Assuming it was offered) (Outlier)

Sale 2

http://www.tf2outpost.com/trade/26371874 - Sold for a Cloud 9 Tyrant's Helm (49 keys) + 7 keys + ~2 keys in items (49*0.9 - 9 = 35 keys)

Sale 3

http://www.tf2outpost.com/trade/26137775 - Sold for 35 keys (Some keys don't match because of stupid scanner + ain't quick-sale, Outpost date was just glitchy as hell, check the last comment date)

Sale 4

http://www.tf2outpost.com/trade/26088750 - Sold for 30 keys.

Sale 5

http://www.tf2outpost.com/trade/26498182 - Sold for a The Ooze Peacenik's Ponytail (40*0.9 = 36 keys)

Sale 6

http://www.tf2outpost.com/trade/26396167 - Sold for a Sunbeams Bonk Helm (59*0.9 = 53 keys) (Outlier)

Feel free to counter / support my proofs.