I think I've gone all in and won before, but that's just a guess. You should never go all in. It's only a last ditch effort that should be used with caution. Even if you all in with 90% chance of winning, there's still a chance that you can lose your money.
I agree with you. I tried to go all in in my first round of play with 95% chance of winning and I lost. Well, you really have high risk in gambling.
My most betting would be giving 90%. I always leave small amount for me not to be disappointed entirely. Actually i just bet was .05 and i lost. What's no is .01. And at least thats a high amount in our place.