[aleph4]

I don't see this as a purely financial decision. A coffee shop here in Austin recent re-introduced Wifi after years of famously not having it. Presumably, this was because they were lacking the business from the laptop crowd.

Obviously, use common sense and courtesy. Don't take up a large table. Don't teleconference. Buy a something regularly if you plan to stay a while. Don't bring outside food in.

Having said that, I welcome coffee shops that choose not to have wifi. But frankly, I'm less likely to go to them.