Sale 1:

Sold for Factory New Top Shelf Grenade Launcher (~18, according to SCM sale)

http://www.tf2outpost.com/trade/29213006 - B/O of 17

Seller: https://backpack.tf/profiles/76561198334117181#!/compare/1496534400/1496620800

Buyer: https://backpack.tf/profiles/76561198094365132#!/compare/1496534400/1496620800

X = 17 (Capped by B/O)

Sale 2:

Sold for $23.49 on Marketplace.tf

https://marketplace.tf/items/521;5;u6

Buyer: https://backpack.tf/profiles/76561198080318478#!/compare/1490572800/1492387200

https://backpack.tf/item/435011329

23.49/2.1 = ~11.2

X = 11

Sale 3:

Sold for 10 keys

http://www.tf2outpost.com/trade/29214506 - B/O of 10

Seller: https://backpack.tf/profiles/76561198094365132#!/compare/1497139200/1497225600

Buyer: https://backpack.tf/profiles/76561198089433218#!/compare/1497139200/1497225600

X = 10

Sale 4:

Sold with <0.5 keys in items for Smoking Bloke’s Bucket Hat

http://www.tf2outpost.com/trade/28868744 - B/O of 13

Seller: https://backpack.tf/profiles/76561198150174109#!/compare/1492732800/1492992000

Buyer: https://backpack.tf/profiles/76561198103473199#!/compare/1492732800/1492819200

Should be used on the blokes.

Sellers:

11 keys:

http://i.imgur.com/rhf4NZC.png - 10 days

https://backpack.tf/u/76561198089433218

12 keys:

http://i.imgur.com/Iqy9BSV.png - 2 months

https://backpack.tf/u/76561198063640894

13 keys:

http://i.imgur.com/m28QH5S.png - 4 months

https://backpack.tf/u/76561198086948995

http://i.imgur.com/N7WafNK.png - 2 months

https://backpack.tf/u/76561198011321852

http://www.tf2outpost.com/trade/29175544 - 1 month

https://backpack.tf/u/76561198103473199

Sales at:

10

11

17

17 is a huge outlier, especially given the current sellers. Excluding 17.

10 seems pretty low, and R+ubi is paying a little higher than 10:

https://docs.google.com/spreadsheets/d/1zOs-0OfVjLsNYAmMa8_tvi2tA9Rrnok7nEUqDOQuls0/edit#gid=0

http://i.imgur.com/IgniChj.png

Excluding 10.

Going with 11 flat.