Well, it's a silly point. Serving at expensive restaurants gets you larger tips per table. That's the way it works. Same way that if McDonald's had servers that you were supposed to tip, they'd make next to nothing.
The flip side of it is that the more expensive restaurants get less tables per night, so even though they make more per table, a server at a middle of the line price restaurant (i.e. Applebee's) can still make roughly the same because of volume.
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