Actually it does. The question would be why would a person who already has money make a bet? One of the main reasons is, in life not a whole lot is unpredictable. Most people get up in the morning they go to their job or they go to their business, the end of the month they know how much their bills are going to be in many cases at the end of the year you can calculate exactly how much money you'll make.
Gambling however has the uncertainty to it. You might wake up in the morning and go to the track with $50 in your pocket and come home with 5,000. There's something about for a change that that uncertainty is appealing.
It's difficult in a pool room for a guy who has a little money to gamble with guys who have no money. It just becomes them being a mark a sucker. So it's easier to just pass and not gamble with him at all.
I used to see guys come in my pool room all the time, good players. And announce, nobody in this place wants to gamble. Well that's not exactly true, everybody in the place is willing to gamble just make a fair game. In other words they're the ones who don't want to gamble.