How come danielle stampe of GWAR is so good at singing even though she doesnt really sing proffesionally?

I've been obsessing over her song My Girly Ways for a while and I asked a question about who singers with similar singing skills as she does, people came up with some good ones but not what I really want.

The songs that feature her vocals are

Dont Need a Man

My Girly Ways

Fire in the Loins

And the reverse of the question should also be asked. How come she doesnt sing professionally or make her own band even though she's so good at singing. T___T