At the risk of deviating even further from the original question, I think Acorn's and Jim's points apply even more to performers.

In my band (mostly trad tunes and songs) repartee is kept pretty short. I'm not a comedian, I'm a musician. Intros tend to last about a minute, much less sometimes. Furthermore, when we play tune sets we usually play each tune twice through, unlike some bands that play them three, four or more times. This can all add up to cheating the customers! It make a lot of work for us: our full set list can contain 40-odd tunes!

Off-stage or out-of-session I'll happily talk about the music till the cows come home, but music time should be primarily music, I believe.

Same with Mudcat: mainly about the music. I, and I'm sure most of us, have learned a tremendous amount here, and get a bit irritated when discussions descend into irrelevancies, adolescent bickering, name calling and feeble attempts at humour (Do those who tell us their hilarious jokes about titles such as Fanny Power or Cock up your Beaver really think we haven't heard them a million and one times before?).