Those high rollers almost had nothing to fear.
I guess, what they are thinking is that, if they lose continuously, they will just bring their money back from a single win, given that the bets that they are betting is high.
This maybe true if you have a large bankroll but for the small or medium gamblers, this strategy is very risky. If you keep on putting more money in to gambling after continuous loss, there may a chance that you still don't win and keep losing. Many gamblers have become bankrupt because they keep on investing in gambling with a hope to win big, which never happened for them.