Somehow I think everybody seeks attention. Nobody likes to be ignored. Now, some users seek attention by being trolls, others by buttkissing and trying to get the masses approval by pretending to agree with the rest of the group says. Both types really suck, and I think I can tolerate better trolls, at least we can make fun of them and break them.
Edit: and ofcourse not fitting any of the categories above, there is the type of people who come here to share ideas, talk to someone just to have a good time.