Depends on how much you have. If I had money coming out of my ears, I'd probably do something like this once in while myself, just for fun. It's kind of cool making somebody's whole week.
The kind of person that has the personality to earn a lot of money would not likely give away something that didn't benefit them in any way. Rich people are usually the worst tippers and the stingiest of people... and yeah I know a lot of wealthy people personally.