Fite me nerd.

Sale 1: Sold for Aces High Pugilist's Protector[11 keys]

http://backpack.tf/profiles/76561198101950286?time=1432537200

http://backpack.tf/profiles/76561198101950286?time=1432710000

11*0.9=9.9 rounding to 10

Sale 2: Strange Professional Killstreak Australium Blutsauger[18 keys via mini]

http://backpack.tf/profiles/76561198059419214?time=1431586800

http://backpack.tf/profiles/76561198059419214?time=1431932400

18*0.9=16.2 rounding to 16

This sale seems a bit high due to sellers via Outpost

http://www.tf2outpost.com/trade/26056629 13.5 keys for 1 day

http://www.tf2outpost.com/trade/25938146 14 keys for 2 weeks

Calling this sale an outlier.

Mini on Blutsauger: http://gyazo.com/2b9ec6e1b67acd9ead1a5d9c33c2f27b

Rounding to 18 keys

Taking flat price of 10 keys.