The online writing that I do in my spare/skimmed time is all kind of my own experiment with writing different types of stuff that I feel like writing, and even approach to the Internet, rather than stuff that somebody else is paying me to write. Because of that I only have so much time and use pretty much most of that time to write or do things associated with that writing. If/when I get sick of either "real work" or else taking online writing seriously I do take a break and go to the forums (or "Answers" section) to get my mind on something different.
Originally I liked this site because it offered a little more flexibility than a lot of other sites did. I started making money on here, still liked the site, and so had no reason to stop coming back. I don't generally socialize online, but since I do stuff on HP anyway and since the community stuff is here anyway, it's just kind of convenience, laziness/indifference about what else is out there, and habit that makes this site handy (as long I've kept earning decent enough money too, because without earning a certain amount each month things become less convenient, I become less indifferent, and habit then needs to be broken.
Until now, and for my purposes and aims, I've found this to be one of the better sites "of this nature", particularly for the person who wants flexibility with regard to how much "community stuff" he does.
Besides, recently I haven't taken as many "real work" projects as I'd had before, and I HAVE had lots of particularly inconvenient snow and ice; which means I've had more time to find myself bored (but not in the mood to do yet more on any of my own projects). Since I'm already familiar with this site it seems like as good a one as any to kill a little boredom on. :) :) I'm not really someone to do "just nothing at all". I like to think there's a shred of use/redeeming value to how I spend even my "down" time.