What's sad is that these smart people, including ones I've met while working as a SysAdmin for a Prop Trading firm often don't have access to the capital to start their own shops. This is due to the incestuous nature of the Finance world, where it's a lot more about who you know than what you know.
Sadly, they're often in the employ of third-rate CEOs, who always get a cut off the top, and pay the producers a mere fraction of what they made for the firm and their clients.