Stickers are too expensive to produce. No one would want to buy them at $3-4 a piece.

Why do you say that? I'd buy a couple. It's more expensive for people to print their own (set-up, shipping).
I would most likely buy 1 at $3. That doesn't seem profitable if only a handful of people buy them, even at a high price like that. Maybe profitable is going to far too, I don't think the guys would break even at those kind of prices - unless they go through a site that produces stickers on demand - but then surely it will be more expensive.
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