Just in case this ever happens to you

[JustinG]

Does this rule apply at clubs and bars that sometimes require a $10 minimum to use your credit card? That is why I try and use cash as much as possible.

I think the bar thing is to save the bartender time, so they aren't running back and forth to the credit card machine and are making drinks instead. To try and keep people from putting one beer on their card every time they get one instead of just starting a tab.