You just need to have a much wider pool than just one school. If the state has 100 high schools then you helping out at your local school has a net positive effect.
Possible downside is losing schools will have an even harder time competing. As a counter for that you might want some sort of built in correction factor based on the schools population.
Possible downside is losing schools will have an even harder time competing. As a counter for that you might want some sort of built in correction factor based on the schools population.