That is quite a gap yet, and I'm speculating you would lose some business if you went all CC. We have about that percentage and do not even think of getting rid of cash and
coins. If you take a lot of quarters to the bank, then turn on 10s and 20s on your
changer. If you already have those turned on, then you could consider dispensing one-dollar
tokens instead of quarters. (that is what we do) We still accept quarters brought in, and we still deposit a decent amount of those. I suppose the next stage to go to before going only CC is accepting only your
tokens. Brighter lighting and more surveillance coverage go a long way to prevent the occasional attempted break-in.