I don't know where you've gotten the idea that wealthy Americans spending $3M on their homes can't have sidewalks or live near major city centers. It's a big country, so there's lots of places that don't have sidewalks or aren't near a city. But any wealthy American who wants those things can easily get them without making compromises.

(The school thing I'll grant you, although in a car-centric country a school 2 miles away often takes like 5 minutes to get to.)