the answer may be "it depends"...

good singers are always on the lookout for good songs they don't know yet. but many open sings, singarounds can have a large number of "singers" who can't remember or carry a tune, forget the verses or read from the Sing out songbook the same tired songs they did the last time they sang. I've been to so called open sings where the 'gang" only wanted to play the same songs they've done since the 60's or '70's and actually resented if someone did a song they didn't already know. And playlist never changed...

Then there are other monthly singarounds where the same songs get repeated over and over, but they have no problem with hearing new things and sharing a good time.

what tends to bug me most is the instrumentalists who insist on playing along with your song... in the wrong key... and loudly to boot.

so, I can't really say that any given session or singing group is identical... the makeup of folks attending is the big factor.