Martin gale will work on small ammounts on a big balance. Just quit whilst you're ahead and don't get greedy.
Not really, you can also bust on the first few rounds, even if you have a big balance, the risk is actually higher here.
This gambling system works so that you must take ever escalating risks to potentially receive a small reward that does not increase with your increased risk.
You can certainly run up small amounts, though. I wouldn't risk much. But I've made good gains on Martingale, taking profit early always. Sure, my luck could turn though, but at this point, I only bet with pure profit.