Sure , if you look at it like that , yeah. Some of them might be litteraly worthless tough ... what about them?
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There's the cheap stuff they're made out of, I guess. Could sell it for a penny. ¯\_(ツ)_/¯
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The option to trade and sell is still there. Plus each sticker has an actual monetary value. I think 0.00001 or something. With no trading in destiny you can't. It's a pretty grey area though no matter which way you cut it.