If I had a band would not post stuff online unless having a good sounding demo. I'm not into live bootlegs and don't see the point in listening to them nor does it really give me a good idea. I would think the best way to get label attention would demenstrate tight musicianship and also competence. I can't imagine a label willing to send people into studio if they're dipshits and probably need to have an idea about what you/someone sound like recorded. Not that people have be be perfect musicians or anything.