Not the most popular of hats, but even good effects sell. Not too often on the market, so can't show too much proof. 1 on outpost and 2 in the world. However, the one posted sold for an unusual worth 2.6-3 buds. Also sold for a cauldron bubbles gentleman's ushanka.

http://www.tf2outpost.com/trade/20006220 - sold for smoking wraith wrap (bp.tf price 2.6-3 buds)

http://www.tf2outpost.com/backpack/85977 - smoking wraith wrap, no janissary ketche.

http://www.tf2outpost.com/trade/19429107 - selling the roboactive janissary ketche

http://www.tf2outpost.com/trade/19510169 - cauldron bubble ushanka owned by next person to have the ketche (1:1 with ketche, bp.tf value 2.9 buds)