I agree, it does seem incredible (and inconsiderate). I comment on maybe one story posting in twenty and I consider myself a lazy son-of-a-bee. Taking into account the breakdown between updates and new stories that would be what, maybe one in twelve stories? That's not very good. I make excuses for myself (I'm reading with one hand; if I stop to review I'll lose my hard-on), but there's no reason I couldn't go back when I've 'finished' and type a few words. As it is, usually the story I 'finish' with is the only one I give feedback to.
Really though, there are eight thousand-some registered users on this site. I registered specifically so I could post and review. As nearly as I can tell, under three hundred users have ever posted (is that right, Jinn?). If they're not posting and they're not reviewing, why did they register? Anybody? (Of course, anyone who responds would be a poster and therefore ineligible to respond! I think I'd better think it out again!)