Well, I doubt that every computer is in non-working condition. There must be about a couple of dozen that truly work (I'm only counting the compacts here), which is probably more than anyone will ever need.
In addition, I think the objective here would be to create a museum, and not sell everything back on eBay, etc (unless the computer was in really bad condition, but then again, the parts for it may still be useful for another identical computer).
Bottom line- there's a monsoon of possibilities with such a purchase, and I would doubt it would strictly be for "hoarding" purposes.