I'm not sure if it's as many as you think it is .... I own well over 125 anime dvds (not series on dvd, but dvds), and that's a small fraction of the anime I've seen, either rented, on TV, or fansubbed.
Though I've never really gotten tired of harem cliches either, but on the other hand, when I don't want to watch harem series, I just watch something else entirely. I've always tried to watch things in moderation.
