Maybe that's why. I've said before with reference to individual games, you get too much splintering, and there are fewer people talking the same language.
For example, when before or shortly after the CM:BO came out, guys could all talk about playing the demo. It was a common experience. No one was "flooding the market" with user-made scenarios yet. Everyone was "talking the same language" on the BFC forum. But once there were 500+ different user-made scens, people stopped talking about the same scenarios. Then there were 1,000. Then 2,000. A couple of standouts got talked about, but it was hard to feel a sense of community. Some guys tried a "scenario of the month" thread - every community tries that - but it never sticks.
Same thing with having 200 games to choose from. Fewer people playing the same things mean smaller communities. Plus, within those smaller communities, wargamers are funny - everyone wants to run their own website, so you have fewer people in particular commmunities, but more people in each trying to set up their own sites. So it is just fractures within fractures.