I think it is alot like some people, who always eem to have the conversation drift into "work". It takes effort to be interesting, and in some cases to conversate depending on the audience. So "talking shop" is the easy way out, especially if there is any relation or commonality.
So I think it very much becomes the easy thing to talk about. Elders justify slander and judgement all of the time. Hasn't anyone ever heard of someone in effect (or verbatim) saying, "lets just talk.....elder to elder."