This might be true in Wall Street or somewhere else where a trader has infinite or near infinite amount of money at his disposal. Bank's money or other peoples money. He can simply say oh this was a loser, dump it and increase bets next day for an another horse. If he loses again he just doubles down. Then he gets a winner and everything is fine. Every ten or twenty years it gets to the point where FED or taxpayer driven bailout is required and they will get it. Every time. And they get bonuses and paid too so it is win-win anyway win or lose. But as a private investor paying everything form your own pocket and no-one backing you up you just can't dump it all and pick up next because you go broke. Should one who bought BC at 50k now sell it all or just hold and see what happens?