I do know that they're treated very well, but all in all, by the time they're 2, and sometimes younger than that, since all they're "birthdays" are Jan. 1st, regardless of WHEN they're actually born, they're saddle broke and racing.
Sparkys mom, I'm not saying that they'll run him until he breaks down, but you never know if something will happen, like a broken leg or such and have to be put down, and yes, they'll make tons of money putting him up for stud.