Quote from gms:
A few people raised this point previously on what is now, (I think) a deleted thread. The 'Opportunity Lost' factor. If mm's methodology finds more winners than losers, as he claims, than instead of riding a position down 29% (or any such large loss) and waiting for recovery, a stop at a predefined 'Small Loss' would permit reinvesting of the capital repeatedly into other positions during the 'Large Loss' period, that, because of the claimed preponderance of winners to losers, odds would have those new positions become mostly winning positions, thus increasing profits consistently instead of keeping capital tied up at substantially bigger losses. Even ordinary bookkeepers know that. Then, if and when the original position recoups, and mm claims that typically it will recoup, mm could always reinvest again on the way up. Result could be a significant overall performance improvement.
On the other hand, if stopping out at a predefined small loss is not suitable to mm because he feels that his methodology proving time and time again that such losers will become winners and so such stops are not needed (and conscientiously does not care for possible portfolio improvement as per the above paragraph), then mm should consider something else he doesn't currently do: invest more capital while the stock is down at its lows, in order to gain even more profit when it recoups, as his analysis dictates it will, and goes on to gain a further profit of 15% on top, as he states. Not that I would do similarly, but you would think someone as confident as mm in the positive outcome of his losing positions would do just that.