Currently the max bet in blackjack is 25 BTC.
That's pretty amazing. That's around $3000. With splits and doubles I expect you've seen some huge hands.
We've definitely seen a fair share of big hands! Our max bet in Roulette is 100 BTC, so we see some large wagers there as well.
That's the nice thing about keeping everything in BTC

As the purchasing power of bitcoin rises, so do our effective limits.
It boggles my mind to think about the bankroll required to offer limits that high.