The answer lies in: "I want to record demos."

The skill level of your singer needs to be equal to what's expected from your demo. If you're just doing a demo to show off to friends or a band to get an idea of the song, the skill level is pretty low.

If you're trying to create demos to pitch songs, applying pitch correction to your voice isn't enough. A good singer doesn't just sing words on pitch, they'll emote and interpret the song in a style-appropriate way. You're paying for the performance, and that's not something that you can add via pitch correction.

And just like anything else, you may want to consider hiring out other tasks as well - especially if it's not something you've done before. For example, mixing is a fairly specialized skill.

Obviously, you can easily go broke on a pursuit that can quickly eat up a ton of money and bring in no return for your dollar. So at the end of the day, you'll want to also consider what you're willing to pay for a bunch of well-recorded demos of your songs that never got picked up.

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?