It certainly depends on the restaurant and even the shift the wait staff is working. For instance wait staff always make better money working a night shift on Friday or Saturday than say the lunch shift on a Tuesday or Wednesday. I worked at O'Henry's which was more or less a locally owned Chili's and I was lucky to make over minimum wage when working a mid-week lunch shift. That even applied sometimes on a Saturday night if you got stiffed on a few big tables.