Just seems, on the surface, like a bad idea.
What happens when some crazy idiot invests his life savings in an athlete, then said athlete's career tanks, crazy idiot loses everything, and then hunts down and attacks the athlete? After all, it's the athlete's fault the crazy idiot lost everything. Espeicially with the Texans...Schaub's already been theatened at his own house, and you can't even buy Schaub stock yet.
Or even better, you start getting "insider trading" and people close to the athlete, who've bought stock, know before anyone else that said athlete has a career-ending injury, and they liquidate, cash out, and leave the regular joe athlete investor with worthless stock.