I agree with where you are going with that statement completely. The problem is that the vast majority will never look at it the way you are meaning it. Whether it is firearms or matchbox cars people want to have something in their hands not just technique in their head. It is much easier to justify spending $500+ on another G19 rather then on two classes on how to use it to better protect themselves and others. Your classes aren't that pricey but fill up quick so more of us can't get in them when we want so I will spend my money on ammo or put toward another M&P for next year. If I want to take a class and am willing to put out money then it is a real turn off to me if I can't get into it and am forced to wait or probably pass until someone else offers it.
Probably because I am a minimalist, I don't see the necessity to own multiples of basically the same gun. For me, one 1911 is fine. And some day, one M&P 9mm will be fine. (and it will be either a M&P or a Glock, not both. They are too similar and will have the same use for me.) I have one .22 pistol, one .22 rifle, etc. etc. Though taking a class is tough for me to justify financially, if I am at the point that I can afford duplicate firearms, I would take a class instead.