"Some choirs might let you join but skip the concerts, but I would suggest a nice gentle 'everyone welcome' sort of choir first. Rock Choir is quite in your face I think."
There is absolutely no obligation to perform in Rock Choir events. We have several members who just enjoy the sessions and social side but don't want to perform, which is fine. We also have loads who wouldn't have dreamt of performing when they first joined but now have the confidence to do so, which is brilliant.
As for the OP et al, well, there are plenty of people who feel the need to put others down, presumably to reinforce their own perceived superiority. Leave them to it I say. Life's too short to do that or be bothered by those who choose to live their life in a negative fashion.
I love my RC. Our leader is fab, she is funny and talented and great at making everyone feel included. We have also improved loads since the choir started and she gives us plenty of good vocal training tips.
I am a musician myself so I do know the difference. I'm not deluded about my own singing abilities and would not consider myself good enough to sing a solo, but I'm full of admiration for those who have a go.
It's so much more than 10 rehearsals a term. We do loads of other stuff, much of it included in the annual fee. We also have the freedom to stretch ourselves and do different things. At our concert in the summer, our choir leader wanted to do a slowed-down, acoustic version of one of the songs. So that's what we did. She did a piano arrangement and I wrote a violin solo to go over the top of it, which we did with the choir. It was lovely.
So it's not all samey and commercial.