Braden threw a perfect game in 2010. He's now looking for a job. Armando Galarraga threw a would-be perfect game in 2010. He got dumped by the Astros. Phil Humber threw a perfect game in April, and he might get nontendered. Johan Santana threw a no-hitter in June and had his worst-ever season before being shut down with an injury.
The lesson: never pitch well. It's far too dangerous.