Group A is talking about bitcoin a lot to mutually reassure themselves that buying into it was the right move (and also a bit to keep others from selling before they do).

Group B is talking about bitcoin a lot to mutually reassure themselves that staying out of it was the right decision (and also a bit to keep others out since all new paper money entering the exchanges weakens their arguments, at least superficially)

I think that defection rates between those groups are already very low and will keep shrinking.