I wish more people were like my son, too. :) I still worry every time I see a new comment that it might be a troll...

I always leave kudos as a recognition of effort--unless, as I said, I can't manage to finish the fic. At least for me, if I see hits but no kudos, all I can imagine is scores of people reading the summary or the first few paragraphs and then backspacing. But maybe your way of looking at it is a lot more common than mine?