Sale #1(Calling this an outlier)

http://www.tf2outpost.com/trade/19556665

Sold for Memory Leak Cold Killer(3.75 * 0.9 = ~3.4 buds)

Backpack of seller

http://backpack.tf/profiles/76561198036855383?time=1399186800 Before

http://backpack.tf/profiles/76561198036855383?time=1399273200 After

Backpack of buyer

http://backpack.tf/profiles/76561198095729038?time=1399186800 Before

http://backpack.tf/profiles/76561198095729038?time=1399321076 After

Total: ~3.4 buds

Sale #2(Calling this an outlier)

http://www.tf2outpost.com/trade/19631944

Sold for Cloud 9 Whiry Warrior(3.5 * 0.9 = ~3.2 buds)

backpack of seller

http://backpack.tf/profiles/76561198095729038?time=1399446000 Before

http://backpack.tf/profiles/76561198095729038?time=1399532400 After

Backpack of buyer

http://backpack.tf/profiles/76561197965180377?time=1399359600 Before

http://backpack.tf/profiles/76561197965180377?time=1399569806 After

Total :~3.2 buds

Sale #3

http://www.tf2outpost.com/trade/19754888

Traded this + ~6 refs in Sweets for Aces High Hong Kong Cone(5.4 * 0.9 = ~4.9 buds)

Backpack of seller

http://backpack.tf/profiles/76561198048493901?time=1399878000 Before

http://backpack.tf/profiles/76561198048493901?time=1399976933 After

Backpack of buyer

http://backpack.tf/profiles/76561198057080819?time=1399273200 before

http://backpack.tf/profiles/76561198057080819?time=1400113788 After

Total: 4.9 buds

Sale #4

http://www.tf2outpost.com/trade/19901033

http://www.tf2outpost.com/trade/20179353

Sold for Green Energy Armored Authority(4.95 * 0.9 = ~4.5 buds)

Backpack of seller

http://backpack.tf/profiles/76561198082651133?time=1401865200 Before

http://backpack.tf/profiles/76561198082651133?time=1401951600 After

Backpack of buyer

http://backpack.tf/profiles/76561198110768189?time=1402124400 Before

http://backpack.tf/profiles/76561198110768189?time=1402383600 After

Total: ~4.5 buds

Sale #5(Quicksale)

http://www.tf2outpost.com/trade/20229802

Sold for 3 buds?

Invalid sales

Sale #6

http://www.tf2outpost.com/trade/19687233

Sold for Anti-Freeze Platinum Pickelhauber (not priced)

Sale #7

http://www.tf2outpost.com/trade/19769764

Sold for Pyromancer Disco Beat Down(not priced)

Why not include 3.2 and 3.4 into the range? The 4.5 buds and 4.9 buds sales are more recent and looking at 3 buds being a quicksale. 3.2 and 3.4 may be too low.