By the way there is a way to make profit on unusuals, because of the fact people value the hats differently.
You have to know the market though, to know which hat you can sell for what. I know a guy who had an eerie orbiting fire Cheiftan's and swapped it to a Searing Salty, but then he decided he liked the Chieftan's better as a hat so he swapped the Salty to a Bubbling Chieftan's, all on the same day. Don't do downgrades, know which hats/effects are popular and don't deal with cancers, don't deal with duped ones. It isn't difficult to make profit on it, just look in Faron8's bp, he never bought anything for cash (he got a lucky unbox though, but that doesn't account for like 30-40% of the things you see there).
Here's the list of unusual hats I've ever owned (and remembered):
Nuts and Bolts Football Helm
G Fetti Buckaroos
P Fetti Noir
P Fetti Noir
TF2 Logo Ketche
Searing Trilby
P Energy Buckaroos
Flies Chieftans (or N&B, don't remember)
Orbiting Fire Steel Toe
Ghosts Sultan's
Vivid Berliners
P Energy Tricorne
Smoking Jeepcap
Searing Spartan
Vivid Spartan
Scorching Guad
Burning Buckaroos
Cauldron Hallmark
Vivid Private Eye
Smoking Birdcage
Burning Pyro Glove
Flaming Lantern Dapper
Ghosts Company Man
Stormy Storm Brain Bucket
Hearts Merry
Sunbeams Stuntman
Scorching Stuntman
Blizzard Stuntman
Ghosts Merry
Steaming Coppers
P Energy Honcho's
Burning Mining Light
P Energy Tyrants
P Energy Hallmark
Steaming Stahlhelm
P Energy Noh Mercy
Orbiting Fire Pyromancer's Mask