"Not performing is great in theory, if you are financially secure, have a pension etc. If not, how do you keep living?"

I should hope my doctor (or even my car mechanic or plumber) wouldn't try to justify an inadequate job with this line.
I have driven two and a half hours and paid well to see a musician whose name you would all know and whose records I love put on an obviously drunken, terrible show. He forgot words and played sloppily, spending more time telling boring, garbled stories than singing and calling for a glass of tequila every three songs.

I felt as though he had stolen my money and my time. The owner of the venu apoligized to us on our way out, but she did not offer to refund our money.