Proof below. Overpay calculated. Original prices used

Sales

http://www.tf2outpost.com/trade/15322292

http://backpack.tf/id/76561198066145675?time=1383030000 ----> http://backpack.tf/id/76561198066145675?time=1383116400

Seemed to have gotten those 7 buds

http://backpack.tf/id/76561198040848674?time=1381302000 ---> http://backpack.tf/id/76561198040848674?time=1381647600

5 buds + Pink Bills = 5.4 buds

http://www.tf2outpost.com/trade/14849008 - Beams Baker, other guy added 1 bud + 10 keys = 4.6 buds (outlier)

http://www.tf2outpost.com/trade/15743263

http://backpack.tf/id/76561198064254220?time=1385798400 ---> http://backpack.tf/id/76561198064254220?time=1385884800

Phosphorous Trilby + 1 bud + 22 keys + ~7 keys in sweets, other guy added Orange Campus + Orange EA's = 5.1 buds (outlier)

http://www.tf2outpost.com/trade/15620926 - 4 buds + Orb Fire Engi + Orb Fire Buddy + Orb Fire Bonnet = 6.5 buds

http://backpack.tf/id/76561198050853563?time=1381906800 ---> http://backpack.tf/id/76561198050853563?time=1382770800

Misty Whoopee + SF Rocket + Black Lvl 75 Max = 7.5 buds (outlier)

Conclusion

Im finding it a little tricky to call what's an outlier or not, so Im taking off the two bottom and the top sales (for conservative purposes). If I need to resuggest, I dont mind ;) Vote accordingly.

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