It seems to me that would be honest to gambling people to limit the maximum bet to 100,000 bits, if someone loses large sums it could ruin his life, I dont think that the person can recover after a huge loss which is more than his wage which he can get for the whole life.
Someone could have enough coins left over from older days that betting tens of bitcoins at a given time is not an issue for them, if they feel like betting good for them and for bustabit's investors.
And they could still lose a lot of money with a series of smaller bets as many do.
https://www.bustabit.com/faq/gambling-addiction