If Bill Gates takes a fancy to a $100,000 mountain cabin and the owner doesn’t want to sell, he could offer $10 million for it, but that doesn’t increase the market value of the cabin.
Real-estate runs on comps, and the sellers of other houses in the neighborhood love to use the overvalued ones to boost their asking price. In my experience, homeowners always nosily follow their neighborhood sales hoping for overvalued prices because they bring up the going rate in the neighborhood.
Plus, if Bill Gates buys a hours in your neighborhood, it's more or less guaranteed that the prices go up on name recognition alone.
Depends on the fungibility of cabins. If the $100,000 cabin next to yours sells for $10 million, you'd better believe it's going to change your cabin's appraisal.
In the context of real estate, what the remaining potential buyers are willing to pay after Bill Gates spends ten million on a hundred thousand dollar property.