But Mysticism and Laws of Probability were more recent--2003-04-ish, if I recall correctly, and they were all on LJ. And my still more recent (2006) gen fics, also on LJ, received approximately the same number of favorites/bookmarks/reviews. I'm not sure you're observing a fandom culture change, and I'm also unsure that you're witnessing a change at all. I came into fandom already shell-shocked by how much smut I'd found; the quantity seems to me to be proportionately the same.