I think you're wrong! Why? Just cause.

Looks goods. I can agree to this.

Good proof. Just bought mine for basically 12 keys, so, upvote.

Deal with price 13 keys ?

20 pages of deals outpost I did not find any with price 13 keys , but found it :

http://www.tf2outpost.com/trade/7443204 ~ sold 20 keys

http://www.tf2outpost.com/trade/7455770 ~sold bill(spirit)+8 keys~17 keys

http://www.tf2outpost.com/trade/7170831 ~ sold 16 keys

http://www.tf2outpost.com/trade/7246292 sold for BMOC ~ 15.5 keys

http://www.tf2outpost.com/trade/7314210 ~sold 16.5 keys

http://www.tf2outpost.com/trade/7409827 ~sold 16.5 keys

http://www.tf2outpost.com/trade/7471892 ~sold 18 keys

http://www.tf2outpost.com/trade/7198091~ sold for unusual gym rat nuts and bolts 1.1-1.4 buds

All the real deal (1-3 days) , I see no reason to change the upper limit on the 3 keys (1-2 maybe), and the lower understated by one key

Although I'm pretty sure that you will take this price and I should not try to