If you set max win 1 btc when you only have bankroll 15 btc, it's only need 15x wins and it wiped out all your bankroll'sote
that site your referring to could be primedice , ive heard that too before where the owner share his experience and said to have started with that small amount of btc but now that they are now popular and have growned alot , 200 btc is nothing to them because they have more than that .
op is asking if he can set up a gambling site with the amount that he said , that amount is huge if we convert it all to usd or to any currency and this is a new site , it wont get popular instanty . he will also limit the bets to the possible lowest amount and not all gamblers are going to win . this could be enough