Meh.

Sale 1

Before: http://backpack.tf/profiles/76561198049597007?time=1428811603

After: http://backpack.tf/profiles/76561198049597007?time=1428822000

- Sold with a Cloud 9 Liquidator's Lid (21 keys) for a Duped Max's Head (Outlier)

Sale 2

http://www.tf2outpost.com/trade/25468207 - Sold with a Cloud 9 Liquidator's Lid (21 keys) for a Strange Professional Killstreak Australium Scattergun + 2 keys in items (47*0.9 - 21 = 21 keys) (Outlier)

Sale 3

Before: http://backpack.tf/profiles/76561198112652443?time=1426143600

After: http://backpack.tf/profiles/76561198112652443?time=1426349781

- Sold for 29 keys

Sale 4

Before: http://backpack.tf/profiles/76561198105706241?time=1427439600

After: http://backpack.tf/profiles/76561198105706241?time=1427538688

- Sold with a Non-Craftable Summer Hat (7 keys) for a Strange Professional Killstreak Australium Scattergun (45*0.9 - 7 = 35 keys)

Sale 5

http://www.tf2outpost.com/trade/25791297 - Sold for 5 buds 8 keys (4.5*5 + 8 = 31 keys)

Feel free to counter / support my proofs