Seeing as how I don't even have a cabinet built yet, I can't really bring myself to buy these.
But if you ever do small order batches, just for the sake of collecting them, then I'd definitely buy some. Like a 10 per set, or 5 per set, 25 per set...etc. I know that handling smaller quantities would consume more time and may discourage large purchases by some people, but it might also draw in more customers who don't really need 100-200 coins laying around for a machine thats going to be set on Freeplay anyways.