Yes! You can definitely find place online to play for high stakes. The important thing is to find a site that you feel very confident in that you can trust them with your money. With all of the shady practices that have been reported out there and because we feel that safety is so important, we wrote a page specifically about high stakes roulette and where to play at.
Dear Readers, I have spent many years studying roulette and have tested all the systems covered on this site except the biased wheel systems and the computers. None of the systems I have tested will win long term when played mechanically. Having said that, I do think it is better to use a system rather than just throwing chips on the table. Although, mathematically it probably doesn’t make that much difference. I feel better about my chances when I have a system that I’ve tested and I know what to expect. And that always includes the reality that I will lose on some of my trips. Try to limit your losses and capitalize on your wins. Easier said than done, I know. Maybe even impossible. Never bet more than you can afford to lose and have fun.
By the way, I want to take a moment to point out that this tidbit above about even money bets in Atlantic City is just one of the many fabulous bonuses you learn about for free on this site, which you might not find out about from books that cost actual money. When I was learning about gambling, the first thing I did was to buy and read the book The Complete Idiot's Guide to Gambling Like a Pro. But in 332 pages they didn't see fit to mention the low edge in Atlantic City, so I didn't know about it. I found out about it when an Atlantic City dealer took only one of my two chips on a losing bet and I had to ask why.
In addition to these roulette rules, there are some that have to do more with etiquette, but even though they are unwritten ones, are just as important. For instance, people who are just watching the game are not allowed to sit at the roulette table seats and the dealer will kindly ask them to step aside. Those who play, are supposed to place their bets as quickly as possible, without interfering with their peers, so that everyone can wager before the dealer calls “no more bets.”
Even if there isn't a betting limit, and if you have an infinite credit limit, it still doesn't really work, it just doesn't really fail either. If the martingale strategy is continued indefinitely and without regard to betting limits, your bankroll will hit arbitrarily high positive and negative values. The expected value is still negative, but the variation is so high that it your bankroll won't stay either negative or positive.