Admittedly, I don't go to ff.net, mostly because so much of the fic there is awful. What goes into my newsletter are the fics I find on LJ/IJ, most of which are much better quality.
Lots of pairings have LJ comms, and some of those pairings are rare. I know there's one for Sirius/Pansy, and another for Neville/James II, and I think we can both agree those are super rare. I think comm activity is a better way of rating rareness, rather than comm existence. The Neville/Ginny comm hasn't had a post in months, while the Neville/Hannah comm is much more active in comparison.
I think pairing popularity rises and falls, too. Pre-DH, Neville/Hannah was definitely a rarepair. Since JKR's interviews though, there's been a small surge of N/H fic, and it's not nearly as rare as it used to be. Conversely, pre-DH there was a lot more Neville/Luna fic posted than what's found now.
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Lots of pairings have LJ comms, and some of those pairings are rare. I know there's one for Sirius/Pansy, and another for Neville/James II, and I think we can both agree those are super rare. I think comm activity is a better way of rating rareness, rather than comm existence. The Neville/Ginny comm hasn't had a post in months, while the Neville/Hannah comm is much more active in comparison.
I think pairing popularity rises and falls, too. Pre-DH, Neville/Hannah was definitely a rarepair. Since JKR's interviews though, there's been a small surge of N/H fic, and it's not nearly as rare as it used to be. Conversely, pre-DH there was a lot more Neville/Luna fic posted than what's found now.