Mmmm Hmmm? Resuggesting as advised by Cashew

Sale 1

Sold for terror-watt Milkman

http://www.tf2outpost.com/trade/24354194

http://backpack.tf/profiles/76561198137477160?time=1419840000 Before

http://backpack.tf/profiles/76561198137477160?time=1420006795 after

1.85x 0.9= 1.665(1.7)

Sale 2 (outlier)

Sold for G. Fetti Ten Gallon

http://www.tf2outpost.com/trade/24320077

http://backpack.tf/profiles/76561198094901046?time=1419580800 Before

http://backpack.tf/profiles/76561198094901046?time=1419667200 after

1.6x 0.9= 1.44(1.4)

Sale 3

Sold for 22 keys pure 22/13 = 1.7

http://backpack.tf/profiles/76561198060502162?time=1418976000 Before

http://backpack.tf/profiles/76561198060502162?time=1419321600 after

Sale 4 (outlier)

Sold with Steaming DeGroot Experience for Lantern Gleg Bonnet

http://www.tf2outpost.com/trade/24188786

http://backpack.tf/profiles/76561198081247301?time=1419127169 Before

http://backpack.tf/profiles/76561198081247301?time=1419148800 after

(2.14x13) -15 = 13 keys = 1 bud

Feel free to support/counter my proof