Because even 15 ref doesn't seem to sell too well, I decided to give this a try.

Unsolds for 16:

http://www.tf2outpost.com/trade/25717208 - 3 days (decided to use my common sense, and guess he's selling for bp.tf price, since the all-father was also sold for 9 and he does mention the pricesheet)

http://www.tf2outpost.com/trade/25728477 - 1 day

http://www.tf2outpost.com/trade/25740495 - 22 hours

http://www.tf2outpost.com/trade/25749022 - 5 hours, non-bumped

Sellers for 15:

http://www.tf2outpost.com/trade/25720413 - 2 days

http://www.tf2outpost.com/trade/25741713 - 19 hours, auto trade bot

http://www.tf2outpost.com/trade/25747570 - 9 hours (kinda young)

Conclusion; Quite small market, seems hard to sell. Let me know what you think, I'm still new to this so pretty much any feedback is appreciated.

Note: This seller http://www.tf2outpost.com/trade/25728477 has not sold his, just closed that trade and made a new one http://www.tf2outpost.com/trade/25752176 states that the prices are shown on his bp.tf profile which means he is still selling for the same price.