Classifieds :

Page 1 - http://imgur.com/SWL7j4d - 2 at 11 ref | 8 at 12 ref

Page 2 - http://imgur.com/o20eaIA - 1 at 12 ref | 1 at 12,66 ref | 1 at 12,88 ref | 1 at 13 ref

Sellers :

http://www.tf2outpost.com/trade/27094558 - 13 ref

http://www.tf2outpost.com/trade/27093636 - 13 ref

http://www.tf2outpost.com/trade/27091536 - 14 ref

http://www.tf2outpost.com/trade/27091497 - 14 ref

Unsolds :

http://www.tf2outpost.com/trade/27078717 - 14 ref (2 days)

http://www.tf2outpost.com/trade/27055853 - 15,33 ref (4 days)

Conclusion :

A bit conservative. Using classifieds to set the low end as there aren't much on OP. Not adding 11 to the range as there are buyers at that price.

Not adding 14 to the range as there is 2 days unsold at that price.