Mark Cuban

A unique entry in this list is that of a team owner. Mark was a failure as a carpenter, cook and waiter. Fast forward to 2000, he was the billionaire owner of NBA's Dallas Mavericks.

I've learned that it doesn't matter how many times you failed. You only have to be right once. I tried to sell powdered milk. I was an idiot lot of times, and I learned from them all.

says Cuban. "Winners make the most errors . . . because they NEVER quit."

This simple yet effective way of thinking helped Mark change his fortunes.