Could you make each purchase include an hour of wifi? It wouldn’t be too hard to set up and I don’t think people would mind.
Or after an hour keep providing wifi but put up a guilt screen explaining that you have costs etc.
Or after an hour keep providing wifi but put up a guilt screen explaining that you have costs etc.
I think the reality of the situation is that it's WAY less of a problem than people make it out to be; most every coffee shop I've ever been in has been mostly empty.