I think he was banned.

As to 50K from a bank of 6K?
You can make 50K from less than that, if you have a good selection method, if you haven't no bank is large enough.

Some people argue about the size of bank because of the effect of runs of outs.

Anyone stupid enough to let go of even half of the 6K bank without doing somet about it, deserves to lose it.

Again I state: If you have a good selection method and have good discipline in betting, you can start with a hundred bucks and build up your bank and make a profit.
Good luck