Hey, this is my first suggestion, leave any criticism / support / counter proof below :D

Unsolds for over 17 keys:

http://www.tf2outpost.com/trade/25134177 — 20 keys —> Specialized Killstreak ( 3 weeks )

http://www.tf2outpost.com/trade/25057568 — 22 keys —> Specialized Killstreak ( 3 weeks )

http://www.tf2outpost.com/trade/25348835 — 22 keys —> Specialized Killstreak ( 1 day )

http://www.tf2outpost.com/trade/25313543 — 19 keys —> Killstreak ( 5 days )

http://www.tf2outpost.com/trade/24917246 — 25 keys —> ( 1 month )

Unsolds at 17 keys:

http://www.tf2outpost.com/trade/25284851 —> ( 1 week )

http://www.tf2outpost.com/trade/25289351 —> ( 1 week )

http://www.tf2outpost.com/trade/25351828 —> (1 day )

http://www.tf2outpost.com/trade/25291038 —> (1 week )

Sellers at 16:

http://www.tf2outpost.com/trade/25302873

http://www.tf2outpost.com/trade/25266914

http://www.tf2outpost.com/trade/25252230

http://www.tf2outpost.com/trade/25125536

http://www.tf2outpost.com/trade/25320101

http://www.tf2outpost.com/trade/25330863

15 key sellers:

http://www.tf2outpost.com/trade/25146871

http://www.tf2outpost.com/trade/25326950

Conclusion:

The current range is 16-17 keys. There aren’t very many sales at 17 (as seen in unsolds), and there are a lot of sellers for 16 keys (and a few for below 16). Thus kicking off the high end and lowering this to 16 keys.

Thanks to Zapperzz ( http://backpack.tf/u/76561198067795713 ) for the help!!