People doesn't get understand the math. They think the martingale will work if they have great balances. But in the theory it can be red for 2000 times and you can't do anything about it.
That reminds me of a quote I heard a while back that went something like...
"The lottery is a tax on people who are bad at math."
I think the same could be said about dice/gambling sites, although not everyone who gambles is there only to make money (some gamble for fun and consider the losses an entertainment expense).
The thing I keep in mind when playing a game where the house has an edge (even 1-2%), is this: You will ALWAYS lose in the long run, always. If you are lucky and win in the short-term, take the money and run. The longer you keep playing, the better the chances of giving it all back (and then some).
So play and have fun and remember: It's not how many chips you win or lose, it's how many chips you walk away with and how much fun you had doing it.