[grafs50]

Also, the average at-home trader probably doesn't sell at a random point in time. They are probably more likely to sell after a loss.

[lend000]

It's often the opposite which is responsible for poor trading performance, due to the fundamental anomaly of markets: trends. Poor traders don't let winners ride and let losers ride to get above their break-even point, which often results in huge losses betting against the trend.