I think a few people have suggested starting this before, but the general consensus seemed to be that it wasn't necessary, since there are players (not sure exactly how many) that have all the rares, and anyone can get all the rares if they play enough. Conversely, the nymphs are luck of the draw (or spin!) and so nobody has all of them. (legitimately, anyway)
If you want to count mine, I've got six each of all the rares in both unupped and upped. I just sell anything past six periodically, since they're useless.