Here we go again. Please, actually read this, this time:

How Halloween 2014 effects will be handled (at least for now):

Regardless of whether a hat sold to a collector, you must have at least TWO sales for all halloween effect hats without exception. We'll probably change this rule in December. So if you do see a 1 of 1 hat go to a collector, bookmark the trade and hold onto it until then and you'll be able to price it off one sale before the sale becomes too old to use.

Feel free to resubmit in a couple of weeks if this is still the only sale: http://forums.backpack.tf/index.php?/topic/23324-what-the-fkis-wrong-with-you-people/#entry259002