Yeah, but the danger is that cash-only businesses will have smaller check sizes, and at the end of the day that probably translates to less in alcohol sales. So, if sales decreases because of unfavorable payment methods (such as cash), then it's the high-margin item (alcohol) that probably gets affected most.
If we’re pondering about how to run a restaurant, I think that’s a complicated and nuanced discussion that will have different ins and out depending on what restaurant, where, serving who.
For instance a lot of lunch focused restaurants won’t serve much alcohol if at all. High volume low check size restaurants also abound. Do we also call cafes “restaurant” if they serve hot food at the table ? etc.
A tourism oriented restaurant will go so far as to accept American Express and swallow the fees, while a local restaurant can refuse anything other than cash and the local prepaid card, it really varies a lot.
PS: we might be missing context on if we’re only taking USA, as the article is about that, or on more global range, which I think is more interesting on the Visa/Mastercad discussion.