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Yes, it is incredibly douche to sell a signature. Celebrities and the like don't mind signing stuff for their fans, because they know it means a lot to them. But they're not interested in wasting their time signing things for some douche bag who's just gonna sell it [for personal profit] on e-bay. It's a piss off to the person who's signature you got, and don't fool yourself otherwise. They don't like it. Period.