I have a friend that I used to drink with. Every time we went to a bar, I knew that he doesn't want to pay the rounds, because he went straight to sit at a table, in a corner.

When you are thirsty and your pocket is well enough, you don't go to a table, you sit at the bar, standing up. And order one by one... People that goes to sit at a table will not drink too much, are just passing by.