IMO, people who mostly/solely deal with trading are just jerks. Theyll do anything for a profit, to try and scam or create false illusions of pricing. Even the closest friends i had when i did trading frequently would try and get decent profit off me. Some dump money into the game, some have actually worked their way up from a crappy unusual to an epic one (through making profits, trading their way up through giving bad deals etc).
DISCLAIMER: This is just the people i dealt with, does not apply to all traders. Some are legit