Ok.. with you saying that the owners would be responsible for the payout your version makes sense.
Still .. are you sure its actually that way?
Because that could mean that in a bad scenario (some whale wins a lot on the site ) they would be liable to huge payouts because of the leverage?
Either that or they are setting the max-bet limit really low so that swings above some few % are mathematicaly extremly unlikely.
I'm like 99.9% positive, I'll ask ethan_nx to come in here and look over my logic and make sure I didn't miss anything. I've spent the last 4 years or so doing on and off btc gambling on many different sites, and I've modded for 3 different dice sites, so I have a pretty good understanding of how they work, but I am human and I can make mistakes.

And if a whale won a lot on the site, they wouldn't be paying anything to investors, only the whale.

And you're right, most casinos place the max win per bet limit at anywhere from 0.10% to 1% of the effective bankroll, which helps mitigate massive losses being incurred. Because as the effective bankroll drops, so will the max win per bet. This prevents a whale from coming in and dropping 200btc on 2x and winning half the bankroll haha.