Meh.

Sale 1

http://www.tf2outpost.com/trade/24198953 - Sold for a Circling TF Logo Tyrant's Helm (2.8 buds) + 7 keys + TS Bills (2.8*0.9 + 1 = 3.5 buds, bud = 12 keys)

Sale 2

http://www.tf2outpost.com/trade/24010693 - Sold for a Searing Plasma Tyrant's Helm (3.4*0.9 = 3.1 buds)

Sale 3

http://www.tf2outpost.com/trade/23809904 - Sold for an Aussie Scattergun (3.1 buds) + Strange Professional Killstreak Equalizer (4 keys) (3.1*0.9 + 0.3*0.9 = 3.1 buds)

Feel free to counter / support my proofs.