Should have traded my Strange PDA for this...

Sale 1

http://www.tf2outpost.com/trade/22001445 - Sold for 15 keys

Sale 2

http://www.tf2outpost.com/trade/21416110 - Sold for 20 keys (Outlier)

Sale 3

http://www.tf2outpost.com/trade/22105682 - Festive set (13*0.2 = 12 keys) (Outlier)

Sale 4

http://www.tf2outpost.com/trade/21713157 - Sold for 17 keys (Outlier)

Sale 5

http://www.tf2outpost.com/trade/22120151 - Sold for 14 keys

But then, 14 is outlier because:

http://www.tf2outpost.com/trade/22243906 - Sold for 14 keys (QS)

Sellers

http://www.tf2outpost.com/trade/22119986 - 16 keys

http://www.tf2outpost.com/trade/22255740 - 17 keys

http://www.tf2outpost.com/trade/22144228 - 18 keys

http://www.tf2outpost.com/trade/22187368 - 1 bud

Unused sale

http://www.tf2outpost.com/trade/21870889 - Unconfirmed because of rage kid.

Feel free to counter / support my proofs.