I know Crait on here had a green dyed chick, and I know that he cares for his chickens greatly, so not everyone gets them because its of the mainstream.
As for buying.. I'll stick with natural, I find they're much more pretty when they grow up.
Many of our chickens are from people who's kids wanted one or two for Easter, then got bored, which in itself is sad, I don't think people should get animals already knowing that they'll eventually 'rehome' them.