although the non-paying non-guests can be a bit overbearing, i mainly find it annoying for the staff. it sucks to see a "crowd" hanging out, knowing the folks who work there aren't going to see any money out of it.
like this chick, who (at 12:35 and 14:50) specifically is like, "oops, i hung out at xtabi and didn't even buy a drink there. gotta stay on my budget!!!"