I got my Kindle just a couple of weeks before Christmas. I have 765 books in my calibre library. Of those, 26 have been read, 11 need "fixin' up", and the rest are on my Kindle. Wait, no, that's not quite accurate - I've read 3 books since I last updated my Kindle, so I've read 29 but 3 of those are still on the K3.
One of the reasons I keep so many on my Kindle is that I only update/sideload when I need a charge. In that sense, I've improved because for the first couple of months I was playing with my collections almost daily. I read a lot of different genres, so it's important to me to have a wide selection of both fiction and non-fiction available.
There was a period of time when the available freebies were lacking or were re-releases I already had, but now things are getting interesting again, so my obsession continues. Sickness? Perhaps, but in the realm of unhealthy behavior, I've done worse.