Honestly people who have the money for gambling this much also has the chance to keep gambling as much as possible. They could simply just ignore all the money it would cost them and keep gambling as much as possible to get there, this is a game challenge for them. Like how you would open up your steam account, pick a game, play there and get an achievement on that game? It is like that for them, because they have so much money that the amount they spend here is nothing to do them at all, it is like game money for them.

At the end of the day they will win these things, wagering competitions, closes to bla bla competitions, many things like that, you could even do something that is not regarding money and they would still have a bigger chance because they are capable of gambling so much without caring about what they are losing. This is not really a bad thing, if you are rich and like doing it why not do it?