One wide range to rule set the bar for them all

Sale 1

[No OP Trade] Sold for 50 keys

X = 50

Keys https://gyazo.com/6f07a1dc86e596d38a8a6e40205c092b http://backpack.tf/profiles/76561198051995072?time=1438930800&compare=1439017200

Bear https://backpack.tf/item/3270290288

Sale 2

http://www.tf2outpost.com/trade/25985828 Sold for Stormy Raincatcher + Smoking Wraith + 15 keys

B/O for Necessities was 85

X = 40*0.9 + 15 + 17*0.9

X = 66

Keys https://gyazo.com/ebc31b26e7290ba301624724a8aaa34f http://backpack.tf/profiles/76561198160752094?time=1437721200&compare=1437894000

Raincatcher https://backpack.tf/item/2683503256

Wraith https://backpack.tf/item/3397784727

Necessitieshttps://backpack.tf/item/3270290288

Mini for Wraith

https://backpack.tf/vote/id/5600f74adea9e95b538b472b 40 keys, using 40

Mini for Raincatcher

http://www.tf2outpost.com/trade/26790855 Sold for Blizz Geisha + 2.5 keys of sweets

Raincatcher was "offered" on the Geisha

B/O for Geisha was 14

X = 14 + 2.5

X = 17

Geisha https://backpack.tf/item/1010516767

Raincatcher https://backpack.tf/item/1357098333

Also sold for a Morning Glory Bear Necessities, possibly indicating that the ~30 key price of that hat is low