I go to a lot of open mics. It's a common and understandable desire. It's easier to start being a comedian and harder to be a great comedian than people realize.

Having seen enough comedy and preferring to not depend on an audience to do a craft, I think I'd rather train to sing well (I was lead in a musical at a really young age and miss being able to create nice sounds). That said, I think comedians are musicians in a way. Their instrument is the audience.