@doctorderp
Word of mouth is powerful in Japan, moreso than America in most cases.
If you so much as offend a couple of customers you can see marked immediate or future losses.
Remember, they're not advertising this on like TV or anything - word spreads by people talking about it and the good time they had there. If someone refuses to mention it, or says it was horrible, that's likely more people who would have come that now won't. That keeps up, eventually everything dries up, not enough customers to deal with upkeep, and you lose your job.
On top of that is that service positions are fairly submissive in Japanese culture (which they're supposed to be), just the customers are also culturally-inclined to be less bastards to the servicefolk. Still happens, though, just it's not as normalized as it is out West here.
This is what I can say from my experiences living over in Okinawa.