Mark Cuban belongs to a very select group of entrepreneurs who built a company with the right technology at the right time and then sold it to the right buyer at the top of a market.After going public, Broadcast.com was bought by Yahoo in 1999 for just over $5 billion in stock, making it one of the best exits for any dotcom during the Internet boom. Cuban used the windfall to buy the Dallas Mavericks of the National Basketball League and set himself up as one of the most visible -- and voluble -- moguls in professional sports. He is also an investor in entrepreneurs, as long as they have "an original idea.""If you've got the next YouTube or the next ... [ Read more ]