100k isn't a very large bankroll to attract players to begin with. On top of that, the risk of variance bankrupting you at such a small starting bank is much higher than a casino with a proper bankroll to ride out a hot streak by a big player.
Depending on how you want to give assurance to your players that they are allow to win and bet high amounts but I guess with that amount, that's still considerable amount for just start. Because as your casino site keeps running and does have a good outcome at its first launch then that will attract some investors and players that will make your site more profitable.