Hate to inform, but it seems that the "really vague shout for help" problem is seeping down into the newbier levels.
I recently got mugged on by someone asking for "six elvaans to complete a quest." I basically ignored the shout because I figured there was no way I'd be able to help with anything, and then the dude jumped me by the fountain in N Sandy with the same request. He didn't say which quest he was looking to complete ("
Introduction to Teamwork"), called me a "nob" (whatever that means), and acted all huffy when it took me a second to figure out how to join the party (my retarded controller-typing also didn't help, but that's my problem). By this point, I'm like "ho kay".
He gets, like, four of us together, then says, "Let's go to the tower!" and runs off. I'm like, "Wait a second... which tower where? A tower out in Ronfaure? Didn't he need six of us? What is this person talking about?" Finally, after limping around confused for a while, I got tired of feeling stupid and bailed.
Not more than two hours later, I got up into the watchtower and activated the quest and when it dawned on me what had happened, I very nearly sent that dude a /t letting him know that if he'd have made more sense in the first place, we'd have all gotten ahead. Third-Rate Organizer indeed.
But to answer the original question, I'm perfectly willing to help out the "random person", but if I'm not going to harbor a whole bunch of guilt for backing away from something I don't understand or know I can't do. Pretending to be something you aren't is the epitome of jackassery (IMO). If people want to take my silence as me ignoring their call for help, so be it, but there are times when I know my "help" can't possibly be enough. But I also know that once I *can* be of help, I certainly will try.