Sales supporting the price:

Sale 1:

Sold for 14 keys

http://www.tf2outpost.com/trade/27919715 - B/O of 14

Seller: http://backpack.tf/profiles/76561198238854082/#!/compare/1457164800/1457251200

Buyer: http://backpack.tf/profiles/76561198057254231/#!/compare/1457164800/1457251200

X = 14

Sale 2:

Sold for 11 keys

http://www.tf2outpost.com/trade/27870556 - B/O of 13

Seller: http://backpack.tf/profiles/76561198068219260/#!/compare/1456128000/1456214400

Buyer: http://backpack.tf/profiles/76561198002757046/#!/compare/1456128000/1456214400

X = 11

Sale 3:

Sold for Pro. KS Australium SMG + White Bruiser's Bandana

No outpost link available

Seller: http://backpack.tf/profiles/76561198134460301/#!/compare/1455523200/1456128000

Buyer: http://backpack.tf/profiles/76561198214598141/#!/compare/1455523200/1455609600

X = 11 + 1

X = 12

Sale 4:

Quicksold/Sold to a quickbuyer for 9 keys

http://www.tf2outpost.com/trade/27866173 - B/O of 14

Seller: http://backpack.tf/profiles/76561198107138670/#!/compare/1455868800/1455955200

Buyer: http://backpack.tf/profiles/76561198068219260/#!/compare/1455868800/1455955200

X = 9

Additional Sales:

Sale 5:

Sold with Terror-Watt Crocleather Slouch + ~1 key in items for Australium Knife

Seller: http://backpack.tf/profiles/76561198214598141/#!/compare/1455868800/1455955200

Buyer: http://backpack.tf/profiles/76561198107138670/#!/compare/1455868800/1455955200

Seems a bit low. Probably shouldn't even be used to update the Crocleather, as this suggestion would bring the Slouch to 11 keys. Also a bit too much of a bulk sale to be used.

Sale 6:

Probably not a sale, looks like this guy either sold stuff on the SCM or gave stuff away

Seller: http://backpack.tf/profiles/76561197985052965/#!/compare/1450339200/1450425600

Buyer: http://backpack.tf/profiles/76561198090560650/#!/compare/1450339200/1450512000

Buyer at 11 keys:

http://www.tf2outpost.com/trade/27760395

No current sellers

Sales at:

9 - too low

11 - pure sale, countered by buyer

12

14 - pure sale