Resources are mainly property taxes. Unless they're building a new house whose value is significantly greater than the median for the area, families gaming the system aren't likely to have much of a lasting impact on the district.
Yeah you’re right. However, resource gaps can be filled by things like volunteer librarians, teacher wishlists/donations, field trips, strong PTAs, etc..
This is common in my city. It’s a big underfunded school district with a handful of coveted, well supported schools. I’m assuming it happens elsewhere in America with the success of platforms like donors choose.