huge bankroll still has a limit , so it would still never work to earn profit . at some point you got a losing streaks and that time the whole bankroll you have just gone in a couple seconds, martingale betting system was never ever be a good strategy it's even the worst strategy to sucks your money faster in regret. even you know when to stop , when you do martingale continuously in the next days , it's useless.
There is no otherway but to do a forced stop whenever you win after a long losing streak. That is the best strategy for martingale in order to book a winnings. If we keep on going with this method without stopping, then we can just find our bankroll emptied since martingale is disastrous in the long run.