I got rid of my R4, and a lot of other vacuums, and many more to go yet, because I have lost my workshop and storage garages. I am presently paying $200/month for storage that I can neither afford nor want to keep.
With nowhere to work on, maintain and store my collection, I don't see any reason to keep so many machines anymore.
Besides, at age 53 and starting to look at things from the perspective of "getting a bit older," I'd rather do this now, gradually, a little at a time, rather than to have to do it when I'm, like, 80 -- or, worse, leave it for someone else to do after I "shuffle off this mortal coil."
Little by little, I am going to prune my collection back to just my set of "The First 50 Years of American Electrolux," a few Kirbys, and a couple of other odds and ends including my Singer R1, my Stan Kann Memorial Hoover 700, my Eatonia, and my GE Roll-Easy. Probably just about everything else is going to go including my collection of "rocket ships and flying saucers."
I've already gotten rid of nearly all my "to do" vacuums other than my really oldest and rarest Kirbys and my Air-Way Green Goddess. I've gotten rid of many boxes of parts and inventory because no one answered my plea to come get them when I had to empty out my garages. I literally had nowhere to keep all that stuff anymore.
Yeah, it's sad - tragic - a shame. Believe me, no one is unhappier nor more disgusted than I am. But sometimes life dishes out some big lumps, and all we can do is take them and move on.