They cause too much brain damage.
Just Cause
Cause the last black person who dreamed, got shot.
The taste
The taste. I'll show myself out.
The game where players make enough money to risk getting brain damage, or the debate where the players already have brain damage?
He never got banned.
Because they can't compete with an invisible power that actually exists
The players all drowned in spring training.
Because he couldn't pronounce Miss Philippines.