Probably not the best move, but they will figure it out. A few years back I went to a favorite breakfast place on the west end. Overnight they had printed new menus and nearly doubled the price of food. We looked at the menu, told the server it was too much (the owner was there in the back round) and walked across the street to another restaurant. I never use a card in Negril and don't plan on starting now.
Regards,
Bob