Only 3 months outdated, but a needed small adjustment.

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Sold for [3 buds + B.M.O.C. (.53)]:

http://www.tf2outpost.com/trade/24598258

http://backpack.tf/profiles/76561198044428318?time=1421136000

http://backpack.tf/profiles/76561198044428318?time=1421222400

~3.5 buds

[Sold with Purple Energy Surgeon's Stahlhelm (9.5) + Strange Professional Killstreak Australium Knife (~2.4)] for duped Purple Energy Modest Pile of Hat (~13):

http://www.tf2outpost.com/trade/23315428

http://backpack.tf/profiles/76561198058283562?time=1421020840

http://backpack.tf/profiles/76561198058283562?time=1421049600

Results a value of ~1-1.5. Neglecting.

Sold for 3 buds + 10 keys:

http://backpack.tf/profiles/76561198058283562?time=1417852800

http://backpack.tf/profiles/76561198058283562?time=1417939200

Buds were 13 keys. ~3.8 buds.

Sold for [Nuts n' Bolts Killer Exclusive (2.35) + 1 bud + 10 keys]:

http://www.tf2outpost.com/trade/24459977

http://www.tf2outpost.com/trade/24574712

http://i.gyazo.com/b47b8c145d51f240e38008b17cbab079.png

2.35 * .9 + 1 + .67 = 3.785 buds

Rounded to 3.8 buds

Sold for 55 keys.

http://backpack.tf/profiles/76561198018705325?time=1421049600

http://backpack.tf/profiles/76561198018705325?time=1421136000

http://i.gyazo.com/b47b8c145d51f240e38008b17cbab079.png

~3.7 buds