Comment by mikepurvis

I've been to several cashless cafes that just had a Square tap thingy.

That said, I expect the cost of taking cash does scale to some degree with how much of it you take. Obviously you still need a cash register, but if only 10-20% of your business is cash, maybe it only needs to be reconciled and emptied out every second or third day? And it's a faster and lower stakes process if there's less in it? Insurance is cheaper as well if the total loss is 1/10 what it would be if every dime was passing through there.