About that Model O ....
John, I seriously doubt anyone's going to pay $10,000 for a vacuum cleaner, no matter how rare, but I could be wrong.
However, the thing to keep in mind about Kyle's Model O is that it was basically THE first electric home vacuum cleaner.Let's face it, NO other vac will have that kind of historical significance. Then there's the fact that it's a hundred years old, so there aren't going to be too many left. You'd be hard-pressed to find anything else that rare.
While I'm certainly no expert on pricing, I've seen Electro-Hygiene uprights in local thrift shops -- for far less than $100.
Rick C.