are there any gamblers who play high limits and always manage to withdraw their winnings from betting crypto sites?
You will have to be more precise than that. What do you consider high-limits or being a highroller? Each person could be thinking about different numbers in their head.
I have never had issues withdrawing from either FortuneJack or Sportsbet.io, and Betja not that long ago. But I don't consider myself being a highroller. If you bet thousands or hundred thousands dollars, there is always the possibility that the casino might want to find out who you are and who they are dealing with. I think that's normal.