Once when I was onstage they threw heavy objects and shouted, 'Why doesn't this idiot shut up!'

Once?

I think JohnCharles's checklist above is a much more accurate way of judging if people like what you do...

Which is why somebody like the Great Unknown - sorry, "Like a complete unknown" - might find it so frustrating to be prevented by mysterious occult forces from ever getting a spot. Or by not actually asking anyone.