Quote from volente_00:
Because of the psychological aspect between emotion, risk, and money. If you have a 100k account and are risking 2 % on each trade, a 2 k loss might hurt a little but you still have 98k to play. If the same trader is trading a 10k account and losses the same 2k, the psychological effect will only wake up the internal demons and the losses will start to snowball. In the end, it all comes down to consistency and expected rate fo return. Having a 100% return system means very little if you only have a 10k account to trade, the trader who makes 10% on 5 mil capitial will always win in the end because he has the ability to not overleverage and does not have to take excessive risk to make decent coin. In the end, there is only 2 ways to make it in this game, have a big enough account that only a small rate of consistent return is needed to generate a good income, or grow some balls, develop some strict discipline, and exploit the hell out of the edge you have using leverage.