Proof below. Overpay calculated. Original prices used

Sales

http://www.tf2outpost.com/trade/17229405

http://backpack.tf/id/76561198042177115?time=1389686400 ---> http://backpack.tf/id/76561198042177115?time=1390032000

1 bud + 10 keys = 1.5 buds

http://www.tf2outpost.com/item/440,2276107598 ---> http://www.tf2outpost.com/item/440,2272918138

Collector's Huntsman = 1.3 bud (mini outlier :D )

http://www.tf2outpost.com/trade/16959721 - 20 keys = 1 bud (outlier)

http://www.tf2outpost.com/trade/16499027 - 25 keys = 1.4 buds

Side note: Buds = ~18 keys at the time

http://www.tf2outpost.com/trade/17337927 - Offered 25 keys (1.4 buds) and 1 bud + 7 keys (~1.35 buds)

1 and 1.3 aren't inclued because it can evidently get higher in pure.

Help / Constructive Criticism / Additional Proof / Counter-Proof is ALWAYS welcome! >;3