Range suggested by Blind Polar Bear

Sold for 17 keys(items calculated): http://www.tf2outpost.com/trade/14821848

QuickSold for 12 keys: http://imgur.com/snDaiZI

Sold for 16 keys(1 bud,16 keys back then):

http://www.tf2outpost.com/trade/13627113

Sold for 16 keys: http://www.tf2outpost.com/trade/14380214

Unsuccessful seller at 18 keys: http://www.tf2outpost.com/trade/13863091

Unsuccessful seller at 21 keys: http://www.tf2outpost.com/trade/15718320

Unsuccessful seller at 21 keys(ME!): http://www.tf2outpost.com/trade/15342060

Therefore, 12 is generally a quicksell, but 16 and 17 are not impossibles. Since most are sold at 16 keys, the range of 14 - 17 would be ideal. Thanks for reading my proof :)