Many luxury apartment buildings in Manhattan have "Do not park in front of the entrance" signs out in front. They pay property taxes. It means nothing. It's a public street. The same thing goes for Bikini Beach. They pay for the right to sell food and drinks but that fee does not include controlling the sand in front of it. If the chairs were free if you buy food or drinks then coolers SHOULD be prohibited but if you pay for the right to sit in one of their chairs, then coolers are OK. They got what they paid for (the right to sell food and drinks) and you got what you paid for (chairs).