It would be REALLY interesting to see the inflation-adjusted cost of rounds thru the years. I'm guessing that the results would be all over the map because there is such a wide range of situations; the amount of competition in a given area, the wide range of both quality and prestige, the practice facilities, debt service on the land, and so on.
I'm too lazy right now to try to find a link; I'm sure it's out there. Maybe later today...