"Did you ever get the chance to discuss this with Bob Copper?"
Yes - as a matter of fact - I did say notable exceptions.

Obviously(?) that wasn't entirely a serious question, so thanks for giving it a serious answer!

I think the sound of the Copper family singing Thousands or More is one of the most beautiful things I've ever heard. I like singing ballads, but I also like being in the middle of a performance of Thousands or More, Fathom the Bowl, Glorious Ale, Pleasant and Delightful, Jones's Ale and several other songs with big choruses. I do agree with aw - "if one person chooses not to join in a chorus that won't spoil the chorus song half as much as one person insisting in joining in with the ballad". But you seem to be ruling the chorus songs themselves out of the traditional canon, which seems a bit excessive to me.

Anonymous Guest Brian -

We are not "a club which persistently presents singers who can't sing". We simply don't have the resources. We do not have an adequate supply of singers who can't sing to do so.

Extreme pedantry and sound common sense, united in one comment. Sir, I salute you.