i dont understand your post. are you saying that if a meal costs $30 at TGIF’s and a meal costs $300 at a steak house, you should leave the same tip?
Yes. Because it is the same work being done by the waiter. The only difference between the two restaurants is the quality of the food, which is something upon which the waiter has no impact.
When I do take the family out, I try to patronize places which do not require tipping, which are usually places where you go pick up the food at the counter when it is prepared. I prefer saving money that way.