For myself, I think the problematic part of the XP system is that I can feel it pressuring me to write relatively inane, vapid things. If I recommend the "Perl Cookbook" again, that's almost a guaranteed 20 or 30 XP points. On the other hand, if I say something controversial (say, express skepticism about "inside-out objects"), then that's at best 5 points.
Sorry for replying so late, but you did too, in the first place! ;-)
Well, my point of view is that you shouldn't care anyway. At some point I did care, like most involved people here. I suppose that those who really didn't, ever, are the ones who come here for quick spoon-feed-me help. But I don't care much anymore. If I feel like posting something that I know in advance to be at risk of getting downvoted, I still do. A number of experienced hackers whom I greatly admire and respect also say something controversial occasionally, which undergoes a similar fate, so although I'm not at their level, I feel in good company.
My most upvoted nodes are relatively dumb questions. So I may invent all sorts of dumb questions just to get many votes. OTOH quite a lot of well thought and accurate answers of mine went fundamentally ignored or received little or no attention at all. I don't care. I care supplying them if I feel I can contribute something to the person I'm replying to, and to the whole community as well. Perhaps I also care to brag and boast, but for what I write, not for the points it can earn.
So the XP system appears to want me to repeat myself, cranking out mindless little things I can write in my sleep that most of us have heard already, but the things that are hard to write and actually require some thought, those would appear to be a waste of time.
Well, for one thing they say that repetita iuvant, and if we were all to only reveal grand new truths, world would either be a shockingly different place, or this would be a much more boring place. OTOH when you say the same old things over and over again to newbies, you do help them. You can point them to prior art. Increase your ability to address the issue. If you feel like doing it, just do it. Think of the XP system as a mostly orthogonal thing and you'll be happy! At most let it influence the quality and the thought you put in each and every thing you write, however trivial it is, as of its barely technical content.