I think in this instance (speaking as a member of the group in question) the high-maintenance may be partially manufactured. What I mean by that is, we have a hosted forum on the boards (and previously various threads in the appropriate forum) where basically you get 24/7 (i exaggerate for effect) interaction about the game. This increases the likelihood that what would be minor personality conflicts (we all have them and none of this is meant as criticism or worse towards any individuals) in a standard once a week/once every two weeks/monthly game, has a chance to create real tensions or other problems, especially given the impersonal nature of this form of communication. I was once a regular contributor to this aspect of the group, but have chosen to no longer submerse myself in the daily goings on online. I've found that I enjoy the game much more, and I can get excited about it, if I haven't spent all week niggling over pittances and getting annoyed with people who are otherwise my friends.
In this case, at least, I think what is (or seems to be) currently a high maintenance situation could be reduced to a moderate maintenance situation with a little space.
Otherwise, I've never been in such a group. Usually IME, if you're not the GM, you're not thinking too much about the game on the weekend until it's time to roll the dice. But I'm a laidback kinda gamer who likes laidback games.