I don't believe in self-exclusion! Why would anyone do that when simple logging out would do the job?! It's either you want to stop gambling and you find some other things to occupy your mind, and you force yourself to not even think about gambling... if you really wish to quit gambling! Who thinks that self-exclusion helps by itself is in delusion, most of those guys who do that simply create new accounts and do everything over and over again. Of course, they blame all others for their "addiction". I simply can't buy that!
As Baby said, the only thing that helps us gamblers not to jump directly into the fire is "normal" balance, something we can always afford to lose without any consequences! It's on us to have control over our actions and to know that things we do come with consequences. Who doesn't respect that will feel how hot fire can be...
If a gambler can not control himself and has such a strong gambling addiction that he creates new accounts to bypass restrictions, he deceives himself. Playing with low balance won't help him either. It seems to me that if such a gambler tries to keep a low balance, he will lose it anyway, and he will be tempted to top up his balance again and again.