Managing your money at a casino requires self-control. Nice to see that you have full control over your money reserved for gambling purpose. Successful casino gamblers understand the math and odds behind the games, but discipline with money is also critical.
I think many casinos now are concerned about this and they provide something like vault system to people can maintain their money. and it's true self control is very important in managing anything. Back to the initial point in the betting budget, it all depends on the individual and their goals. if for fun maybe only a few % for their asset but for those who are looking for profit most of them put big capital for sure.
It really is, if you are a high or low roller and of course, your financial situation. It is hard to bet big if you are just relying from your work money. A lot of high rollers have their own businesses. In my case, I'm just a small time player, using only extra funds to bet. So whenever I log in, I know already how much I can "waste" on the games. I say "waste" because most of the time, I will use all my funds that I deposit before I stop playing.