lei, chances are the wealthiest never waited tables and feel entitled... I've found that some of the richest people I know are the stingiest...they'll always say, "I'll get it the next time" but never actually do. I also find it amazing that people will rationalize about why it's OK to tip 15% or less at a small mom and pop restaurant/diner when the check is ridiculously cheap. When we go out for breakfast, or to one of our favorite Thai restaurants where the tab comes to less than $10 a person, I always tip more than 20%. These servers have to eat, too, and 15% of $10 is $1.50. I have no problem doubling that.