A little trivia about this monologue:
Quinton Tarantino wrote this in the movie as it is his own opinion, but didn't want his own character to say it for fear of backlash at the time. Remember this movie was made before everyone was expecting a tip like they do today.
If you reread my comment, I mentioned the movie was made BEFORE everyone expected tips like they do TODAY. I was a server in the 2000s myself, and today there are tips asked at every register, sports games or entertainment show concession stands for example.