To play devil's advocate here, people also said he should stop at +15 btc, but he didn't, and ended up winning twice as much. It's easy once he has actually lost to say "ha, what an idiot, he should have stopped while he was ahead", since you have the benefit of knowing when he was actually at his peak. At the time, no one knew.
, and would have been a good move to stop then also. But, my point is, that if the strategy was martingale all along, then why risk so much of a bankroll, when it is obvious that martingale fails all the time over a long time. Why bother gambling if your expected return is negative. Sometimes you get lucky and profit more than you should, sometimes you lose. Being up 33 btc, his decision to keep playing should be the same as his decision to play when he was up 0 btc, past results don't matter in the future.
He's not even worth, in general he' still lucky
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