My life would be an empty and meaningless existence without a constant reminder that (a) there are still intelligent people in the world and (b) that there are a ****ton of much more impossibly stupid people in the world than I used to ever think possible and it pleases me, and frustrates me, to know that I'm in a very small pool of people smarter than average.
But mostly because I'm bored, never have anyone to talk to even when I **** well finally feel like talking to someone about something, because verbally speaking (heh) I don't talk very well - I articulate much better when I type my thoughts basically, there's an increased possibility that I'll find someone who interests me for long enough to deem them worthy enough of me calling them a friend - actually it increases a hella lot, because it can increase my problem solving abilities involving other people, and because you never know just what kind of fangirls/boys you'll stumble across and can fangirl/boy over the same topic together in all our glorious blatant nerdery.
...actually it's because I like having someone to talk to but I never leave the house much, by choice, and my friends are not the kind of people I want to potentially go to with my problems (they're kinda stupid like that, that's why they're the ones who come to me). Because my family is made up of a bunch of people who I don't want to go to either, probably has something to do with the fact I have issues speaking verbally and therefore can't say what's on my mind without getting confusing or someone going "ah ha, so you admit it!" while taking something I said totally and completely out of context. But to the point, they're the ones who end up doing all the talking anyway. Even if I do manage to get my point across they still never get what I'm saying, assume something else, jump to conclusions, then it usually ends with me getting a lecture about 'getting a good job where hopefully you might meet a nice, good, man then get married in a few years and give us (great) grandchildren / a niece or nephew'.
At least on forums the conversation doesn't inevitably circle back around to my lack of a job and people thinking I'm never going to get married or have children (I'm 20 for ****s sake, they should be proud of the fact I haven't been knocked up 3 times already).
What I mean in a roundabout way is that, assholes as most people online may be, there's at least people out there who get how I am because they're kinda like that too. It's a small comfort, so I relish in it.
I actually quit using forums a while ago when CG.eu turned into a circlejerk between a few members, making it impossible for anyone else to discuss anything. It annoys me when people think they're above the rest purely because of their post count or something. This only happened because the mods let them get away with it though.
That said, I do enjoy forums. It's nice being able to converse with old friends and people you wouldn't come in to contact with otherwise. It's also nice being able to discuss things with some moderation as this keeps threads on topic and prevents people from launching personal attacks purely because they don't like someone's opinion.
My favorite part of all sorts of forums is meeting new people and seeing how their personalities and attitudes differ, and how all forums are different no matter what the forum is themed on. I also like seeking out people who need help and could use advice on anything, gives me some pride and makes me feel like a better person.
I never used forums until a couple years ago, but now I really like them because I don't talk to a lot of people irl and its nice to be able to share opinions and have the option of talking to people online instead.