Hey, this is probably my weirdest suggestion yet, thanks again to Brendan ( http://backpack.tf/u/76561198031371895 ) and aaroncsn ( http://backpack.tf/u/76561197997116856 ) for the help :D

Sale 1: (outlier)

Sold for Australium Minigun ([29/12]*0.9) + Australium Sniper Rifle ([44/12]*0.9) + Australium Grenade Launcher ([24.5/12]*0.9) + Collector’s Sydney Sleeper ([2.4/12]*0.9) = 2.175 + 3.3 + 1.8375 + 0.18 = 7.4925 (rounding to 7.5 buds)

http://www.tf2outpost.com/trade/25074894

http://i.imgur.com/pSskBi7.png

Sale 2: (outlier)

Sold for Nuts Team Captain (2.95*0.9) + Smoking Brown Bomber (1.9*0.9) + Australium Flame Thrower ([21/12]*0.9) + 2 buds + sweets (~0.1) = 2.655 + 1.71 + 1.575 + 2 + 0.1 = 8.04 (rounding to 8 buds)

http://www.tf2outpost.com/trade/24884293

http://i.imgur.com/TEZEnKr.png

Sale 3:

Sold for Green Energy Le Party Phantom + Prof Australium Blutsauger + Strange Prof Pistol.

Blutsauger = $48.38 = 19.352 rounds to 19 keys, Pistol = $9.79 = 3.916 rounds to 4 keys. 7.4 x 0.9 = 6.66 rounding to 6.7 buds

http://www.tf2outpost.com/trade/24594306

http://gyazo.com/028ebed0a6655c77dd62d11f410ef20a

Sale 4:

Sold for a Cloud 9 Modest Hat (6.5*0.9 = 5.9) + 1 bud = 6.9 buds

http://www.tf2outpost.com/trade/25272852

Sale 5:

It + 1 bud sold for a Smoking Law (8*0.9 = 7.2) -1 bud = 6.2 buds

http://www.tf2outpost.com/trade/25113011

Sale 6:

Sold for a Burning Flames Stout Shako + 20 keys + 2 keys in sweets. (buds were 12 at the time)

(5 buds*0.9 = 4.5 buds) + (20 keys/12) + (0.16 sweets*0.9) = 6.310 rounding to 6.3 buds

http://www.tf2outpost.com/trade/24307721

Sale 7:

Sold for a Scorching Flames Duty Rag + 1 bud + ~8.5 keys in sweets.(buds were 12 at the time)

(4.4 buds*0.9 = 4) + (0.7 sweets*0.9 = 0.63) + 1 bud = 5.67 rounding to 5.7

http://www.tf2outpost.com/trade/25263569

Conclusion:

Sales at 7.5, 8, 6.7, 6.9, 6.2, 6.3, 5.7. Because of so many sales in the 6 bud range I’m calling sale 1 and sale 2 outliers, and taking the final range at 5.7- 6.9 buds. (Thanks aaroncsn for providing me with the final sales and range)