1. Consolodation instead of diversification. I knew EVERYTHING about the stock, product, and company... and it was a sure thing mega hit... so I completely consolodated my portfolio.
2. Margin - I knew how great a winner it was so I went out on margin to maximize profits
3. Risk stock ... both times the stock would be considered a "risk" as it was a new type of product launched
4. I bet against the shorts. Never do this. Shorts always win.
Basically, I lost it all on a "sure thing" twice.
The funny part is I was 100% correct about how good the products were. They were revolutionary and ended up changing the industry... but not until after both companies went bankrupt.