I'd be glad to help anyone about anything if I can, but to help actually you need enough knowledge about the subject. What happens when I don't have enough knowledge (as in Maemo/N900 case)? I basically search Google or wikis to generate an answer; but as you know, those answers wouldn't be as reliable as answers generated from first hand experiences.

So to sum up, I like Maemo Greeters idea since I like helping, but I wish I had a device to be more useful as a helper (And as some people know, I probably won't be getting one)