That must be nice to have accumulated a large amount of capital exclusively for gambling.
They have wagered it, and talking about 100 BTC or 2k BTC, I think it totally depends on the current price of Bitcoin? If not, the wagers will be different at different prices each time they were played.
What advice can you give small players like me, who struggle to build enough capital exclusively for BlackJack and Craps? Is there any other skill, outside of the games, that we should learn? A mental toughness to develop? Probably discipline?
Just take out your capital once you double it, it's possible as it is gambling. Play with your winnings and you will do great. Don't overdo it, win after win, the cycle of luck won't stay for longer, so you must know a point where you should stop doing it.