Meh.

Sale 1

Before: http://backpack.tf/profiles/76561198098308455?time=1432437134

After: http://backpack.tf/profiles/76561198098308455?time=1432450800

- Sold for a Strange Professional Killstreak Australium Force-A-Nature (20 keys) (No overpay)

Sale 2

http://www.tf2outpost.com/trade/25647758 - Sold for a Kill-a-Watt Backbiter's Billycock (13*0.9 = 12 keys) (Outlier)

Sale 3

Before: http://backpack.tf/profiles/76561198152023560?time=1432278000

After: http://backpack.tf/profiles/76561198152023560?time=1432387909

http://backpack.tf/item/1418957505 <-> http://backpack.tf/item/765939587 + http://backpack.tf/item/3739305831

http://imgur.com/aTas2tc <-> http://imgur.com/iH9O2x6

- Sold for a Blizzardy Storm L'Inspecteur (14 keys) + Strange Bacon Grease (8.5 keys) (23 keys) (No overpay)

Sale 4

Before: http://backpack.tf/profiles/76561198151628111?time=1432314927

After: http://backpack.tf/profiles/76561198151628111?time=1432364400

- Sold for a Strange Professional Killstreak Australium Force-A-Nature (20 keys) + 1 key (21 keys) (No overpay)

Sale 5

http://www.tf2outpost.com/trade/25874916 - Sold for a Bubbling A Rather Festive Tree (18*0.9 = 16 keys) (Outlier)

Sale 6

http://www.tf2outpost.com/trade/25699549 - Sold with a Green Energy Hustler's Hallmark (47 keys) for a Haunted Ghosts Cotton Head (62 keys) (62*0.9 - 47 = 9 keys) (Outlier)

Feel free to counter / support my proofs