How are you going to run a casino if any Thai going into it has to pay 5k and have 50K in the bank? Not many of the card dealers or wait staff I know have that kind of money.
your comment says more about you than thailand, i don't know any card dealers or wait staff, but i do know plenty of business owners, business people, lawyers, professionals and for sure they have THAT KIND of money, and more.
methinks you are hanging out with the low class, uneducated, get out of the bar and discover the real thailand and thai people, it truly is amazing if you look.