Quick-firing these things

Sale 1

http://www.tf2outpost.com/trade/27274318 Sold for 19 keys, although rejected 20 keys?

B/O for Bonnet was 22

X = 19

Bonnet http://backpack.tf/item/4014905502

Keys http://backpack.tf/profiles/76561198134999467?time=1446102000&compare=1446015600

Sale 2

http://www.tf2outpost.com/trade/27232817 Sold for Mem Leak Liquid Lid

B/O for Bonnet was 21

B/O for Lid was 20

X = 20*0.9

X = 18

Lid http://backpack.tf/item/1702480583

Bonnet http://www.tf2outpost.com/item/440,4190900211,100,5 (Buyer doesn't appear in history)

Sale 3

http://www.tf2outpost.com/trade/27169588 Sold for Blizz Cone + Pro KS C. Bargain

B/O for Bonnet was 19

B/O for Bargain was 11

Cone had no trade, presuming offered

X = 12.5*0.9 + 7*0.9

X = 18

Bargain http://backpack.tf/item/4109152529

Bonnet http://backpack.tf/item/4014905502

Cone http://backpack.tf/item/1609241110

Mini for Cone

http://backpack.tf/vote/id/565e8c46b98d88a639e94b69 12.5 keys, using 12.5

Sellers

http://www.tf2outpost.com/trade/27426982 a month at 20, that 20 pure offer above MIGHT be risky to include in the range