Trade 1:

Sold for a DP Rebel Rouser:

http://www.tf2outpost.com/item/440,3024771763,30479,5 > http://www.tf2outpost.com/item/440,3025168180,30120,5

3.6*0.9=3.2 buds after overpay. (Price of the Rebel is outdated)

Trade 2:

Sold for a Terror-Watt Sammy Cap:

http://www.tf2outpost.com/item/440,3037359212,30479,5 > http://www.tf2outpost.com/item/440,3037359162,30374,5

2.6*0.9=2.3 buds after overpay.

Trade 3:

Sold for a Nuts n' Bolts HWNN and a Cloud 9 Big Elfin Deal:

http://www.tf2outpost.com/item/440,3005182869,30479,5 > http://www.tf2outpost.com/item/440,3007186612,631,5 + http://www.tf2outpost.com/item/440,3007186752,652,5

(16 keys + 1.6 buds)*0.9=2.3 buds after overpay. (Price of the HWNN is outdated)

Trade 4:

Sold for a Stormy Tossle:

http://www.tf2outpost.com/item/440,3020837828,30479,5 > http://www.tf2outpost.com/item/440,3020837807,150,5

2.6*0.9=2.3 buds after overpay (Tossle is outdated)

Now there may be outdated hats in it, but 3 of 4 sells are 2.3 buds after overpay. That Rebel seems to be an outlier.

I know you guys like to hate about old prices and stuff, but in this case 3 out of 4 sales result in 2.3, so that seems pretty much stable.