I learned that lesson far too late. I get physically ill when I think that I have lost 700 shares due to covered calls that I bought in at an average price of $360.
Sure, I haven't lost any money, and I got 125% return in a year period, but I missed out on $760,000 in gains...
Much regret.
I try to look at the positive side though, that I'm doing much better than Mark Spiegel on portfolio returns!