You do understand that the House Edge on most "Real Casino" games is larger than they are on Dice right ? Who would anyone want to take their Bitcoin, then sell them (reducing their value due to fees), then going to casino where you cant play dice and have a worse House Edge.
I don't see the logic behind it, i really don't. And no, 20k does not make you a king, players play times that per bet.
if see the stat, this man have play 14 time (i see in the screenshot) 64 bitcoin, 20,000 $ x 14 = 280.000 $ in 10 minutes.
iIf wagered 280.000 % in real casino, you have more benefits (free suite, food, ecc) .
You may get those benefits for free, but that is because you actually easily pay for them in fees and house edge. Bitcoin betting sites have a better (or less bad) ROI than real casino's, so if you want to go big that is the way to go.