It all sounds complicated until you've played at one of these casinos. Then if you're in the bonus account (not hard to recognise as you enter a different account number to access it) and click on the "Casino Action" button it tells you the
wr remaining and the available amount to transfer. If you choose to transfer anything it tells you your new balance in the real account. It's actually a model of clarity, which does make you wonder why they couldn't pay someone competent $100 to write an explanation for their website!