It gets pretty subjective when talking about which benefits are worth what, but in general, the more resourceful your network is, the more resources you have.

There probably is a point where "best available" isn't worth it, but I think for many people, they still feel that they need to do whatever they can. NYC is a great example, where unless your kid makes it into Stuyvesant or Brooklyn Tech or equivalent, many higher income parents feel compelled to move to the suburbs. Or even the current uproar where they diminished the testing to get into those schools.