Proof below. Overpay calculated

Sales

http://www.tf2outpost.com/trade/14122269 - S. Action + 5 keys = 12 keys

Using price ~1 week ago (outlier)

http://www.tf2outpost.com/trade/14037453 - Orb Fire Bucket, other guy added 4 keys = 13 keys

Side note: Taking mid-price since it was offered on

http://www.tf2outpost.com/trade/13923919 - NnB Authority + 2 keys (I think) = 16 keys

http://www.tf2outpost.com/trade/13292480 - NnB Tricorne + 1 key = 13 keys

http://www.tf2outpost.com/trade/14102041 - sold for 17? - planets tam (Thanks Bear :3)

Conclusion

Resuggesting according to Bear :3

Help / Constructive Criticism / Additional Proof / Counter-Proof is ALWAYS welcome! >;3