You're saying it's over a million dollars to revive some chromebooks? Or to build out a system that is independent from planned obsolescence? For a school district that has to operate in the long term, I think one of those is a bargain.
Also, the cost of maintaining 2 vs 1000 systems obviously scales up, but it's obviously not nearly linear. The difference in cost between managing 1000 and 2000 systems would be negligible.