Any real examples that don't involve aberrant or illegal behavior? It's one thing to deny access people based upon disruptive behavior; it's another to grant different levels of access to government services based upon commercial relationships.

How's this example: A busy SSA office in a mall with long lines going out the door onto mall property. What if the mall, instead of telling the SSA to resolve the situation, decided to give loyal mall customers the ability to use an "elite" line? Those people granted favor by the mall would use a short line, while others would have to wait for hours. Would this be acceptable?