I must be reading the wrong meta about genre romance; I was under the impression that a lot of it was pirate stories and vampires and other unordinary stuff.
You have a point, though; fanfic descended from SF/F fandom, so it's likely to be scarcer in contemporary romance.
"Perhaps it's just me, but why bother writing fanfiction if it's about the same old stuff, is what I'm saying."
My impression - from having been forced to wade through it to get to the stuff that I like - is that yaoi originalfic (and I gather yaoi fanfic) is positively overflowing with schoolboy love stories. Personally, I can't think of anything duller than reading about schooldays, but I think I can guess where this impulses comes from, because
Leather in Lawnville is about (as Ann Somerville put it) "mixing the mundanity of laundry and potlucks with . . . kink." That's a rather fun way to write a story, actually: To take some ordinary setting and spice it up with the imaginary. ("Lawnville" is actually my old hometown, and yes, the basement in my old house does have a laundry room with all the implements I describe in "Clothesline." Including that dresser with old bike chains. My mother never threw out anything.)