Im not a collector, but over the years I lost count of amount of Amigas I had, turned out I had 15 systems in my house (came as a bit of surprise to me). I know this is not a large sum since there are quite a few here who have more than that.
I see no point in collecting something if it does not get any use, I dont like to keep two versions of a system either, if my A4000 goes down I just get a new one instead, they are not that rare here in the land of the wikings. I am also going to slim down my "collection" to just one system, either an A1200 or A4000 or maybe an A600 since that takes less space.