That books have no problem with you maxing out your CC time after time betting on sports with no verification ever required. However, when you do ask for a payout, suddenly they want scans of the front and back of your ID, a utility bill in order to verify that you aren't using a stolen card.
They make it seem like it's for the protection of the CC holder, but that's clearly not the case. How come you don't need to verify your account before placing any bets?