51 Bitcoin isn't a joke. That is a very huge money but I think his capital is huge too to get that amount. More capital in gambling = more chances in winning huge profits.
not really . it is still possible to earn huge jackpots higher than 51btc even if you dont have a huge capital . most gambling sites offers huge jackpots by just playing thier game while some require waggering . wagerring is hard and this is the only thing that you will be needing huge capital to be able to have a higher chance getting the jackpot prize .