I'd suggest it also matters whether a player gets into the game interested in playing in faction politics and the like in the first place. It may well be you screen out people who don't (either directly or by simply not offering the kind of play they're interested in), but some will go in expecting your example here to be what they care about anyway and ignore the rest.
The campaign went for around 11 years, from the beginning of 1998 (or thereabouts) to the end of 2008. My estimate is that we played for somewhere over 1000 hours. (In the neighbourhood of 300 sessions.)
The player who prepared this chart joined in the second or third year (I can't remember now). At a certain point - I think some time in 2007 - he decided to write up the chart in order to consolidate his and everyone else's notes, about who everyone was and how they were all related to one another.
