Hey at least we are brainstorming but there are some flaws in your assesments.
200k in most states would be plenty depending upon location, even Ca. You're definitely not going to purchase property in downtown LA for that kind of money That also was based on 10m when the price was actually 19m that jumps the $ amount to 380k per state.
That's great and all but sometimes the land fees is only a small portion of the price of a club, in many cases it's the lowest as they get land donated or leased. What about to build the airfield itself? Runways, paving, landscaping, shelter etc. This is where major costs come into play. Then if you don't do pavement you have to buy equipment to mow the grass. Whose going to keep it maintained? Numbers start to add up.
The last option would be for them to sponsor 50 clubs.. They could have put just a little money into developing an already established club in each state and make it into a regional flying site for a minimal expense...
The only problem is that many clubs usually don't get hit up with large grants and when they do they tend to overspend the money or it gets mismanaged. Seen it happen to a club that got 35k gift from ex member. They spent it like water and became more in debt then they started with.