If you drop out, you lose your chance to get a share of the winnings. You never know when it will go down, because high rollers can come in at any time with bigger bets to take it down quicker. There will be multiple games at the same time, so you can jump in and out of different games or just concentrate on one game.
This idea seems that this kind of game is definitely going to be so unfair to all gamblers because it only requires higher rollers to stay in the game until they have defeated the big boss, and even if only higher rollers are the class of gamblers involved in the game, at some point, most of them will exhaust their funds and might want to refile their account, but because they have failed out, they can't re-join the game again, which means they will have to start over. Also, if the game is developed, it will only be high rollers that can engage in the game, while casino owners are looking for even more interesting games that can engage all classes of gamblers, such as high and low rollers.
My idea is that if the game can be designed in two patterns, where higher rollers will have there's and low rollers can also have there's, that might be a bit better.