I have to admit that I don't actually know exactly what a Smart Board is or exactly what its capabilities are, but I get the impression that the replacement cost of such a device is multiple orders of magnitude greater than that of a simpler device, the Overhead Projector, so common in classrooms thirty years ago. And I have to ask the question, is the educational value multiple orders of magnitude greater? Also consider that you don't need a degree in electrical engineering (and other domain/manufacturer specific knowledge) to understand how the mirrors and light bulbs make the older device function, and to repair it.
I fear this attitude comes off as crotchety old man get-off-my-lawn a little bit, but I think if we take a step back and make objective comparisons we might find that we've been had by the marketing department quite a few times in recent years. And I just hate to see public schools (which I think are so desperately important, and don't have the disposable cash) taken advantage of by the marketing departments with budgets larger than the engineering department of their firm. I would be dismayed to see my kids' schools investing into VR/AR any time soon, but I could see it happening.