Proof below. Overpay calculated

Sales

http://www.tf2outpost.com/trade/13006596 - 18 keys

http://www.tf2outpost.com/trade/13420212 - 20 keys

http://www.tf2outpost.com/trade/14355801 - Bubbling Bonnet, dont think anything was added = 19 keys

Side note: Took mid price since it was offered on

http://www.tf2outpost.com/trade/14067783 - Stormy Berliner's = 21 keys

http://www.tf2outpost.com/trade/13660869 - 20 keys

B/O's

http://www.tf2outpost.com/trade/14046159 - "20-22 keys"

http://www.tf2outpost.com/trade/14229435 - 20 keys

http://www.tf2outpost.com/trade/14384244 - 20 keys

Conclusion

Sales to prove new price, B/O's prove 21 keys is an outlier. Vote accordingly.

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