I was in a congregation one time of about 80-100 publishers and I think maybe 40% were converts. It was weird. The elder situation was quite strange too. About 2/3 were converts but the real heavies were the five/six generation real asshole types.
It literally reminded me of the Disney movie minions. If there was a JC it was really just one elder against one person , the other two were just filler and yes men.
It would be interesting to go back and see who is still in. I see they get about 40 cars ( I counted ) on an average Sunday but who knows. They recently merged with another congregation.