Makes me wonder if "one day" they'll be like ANS's - very few left and a handful of collectors that would still PAY for one.
Very doubtful: Apple sold basically hardly any ANSes. Though the Xserve didn't exactly set the world on fire, they still managed to sell a decent chunk of them.
You'd turn around and resell them on eBay for $100 each
That's ... more possible, though I would still recommend checking the going rate before diving in. Specifically, what they actually
sell for, not what they're listed for.