The nature of the typical game and the type of people here, I think. People are 'hot' for a month or two then fizzle out. I see it far to often in one-on-one games, with members who post for a few months then literally drop off the face of the earth with no warning. There is, of course, a core group of players who have been around forever, but recently looking at my posts from 4 - 5 years ago, and most of the people are 'deverified' or haven't logged on it well over a year.