So if "Commercial" success is defined as being able to support oneself from musical activities (including teaching but mainly gigs/ music sales) what is the predominant factor?

I saw on another thread where it stated that 9 out of 10 people who think they are as good as the succesful pros are deluding themselves. Is this correct?

Do you really have to be young and attractive to "make it". Are there any notable exceptions to this (i.e made it after their young and pretty period!)?

I accept most of those who have made it are very talented in one or more areas. (I really do!). I'm very happy to watch them.

I've also seen those with very high profiles disappoint (consitently in one case) in the live arena when judged by any objective criteria I could think of (technical ability, audience reaction, audience interaction).... but still get played consistently on national radio and get a top line or near top line billing at festivals. Is this down to luck, effective marketing or something else?