Every time I see people trading, some of them seem to highlight the fact that their hats are of 'collector's level'. Either that, or they are selling crafted hats with special craft numbers on them. One person even commented on my trade that my hat is of level 42 and that I should up my price. I have no idea whether he is lying to me or not.
As for craft numbers, is a misc with this craft number worth more than usual?
Do these small factors really affect the value of an item? If it does, could someone provide a list of Hat levels and craft numbers that are worth significantly more?