Thats because most dancers are not herpers originally. Most of them just see others dancing with snakes and think "Gee, that looks neat" and without thinking about the snake's care requirements-they just go out and buy one and well....
we all know what happens.
I'm not trying to say dancing with a snake is a *good* idea, but if a bellydancer is going to dance with a snake, there are things they need to understand about the snake's care first. If a bellydancer doesn't want to care for a snake, maybe a stuffed snake will have to do!