10 years ago I got a chance to take a ride on a P-51 mustang for $900 an hour - that was 10 years ago can't imagine the prices now a day's for gas.
Now getting a ride on a F4u Corsair is roughly $2100 an hour today's price, mainly the gas and maintenance to keep the bird airworthy is why its so high.
Think every hour a bird is in the air requires ten folds the amount of maintenance checking on the plane. Last thing you want is what happened to the me109 at the airshow - crash landed causing hundred thousand dollars in damage, almost a total lost in fact.