The price of the Gravely two wheel and 4 wheel tractors have always been high. I recently did a price vs inflation calculation for Gravely tractors starting in 1970. Over the years, the adjusted price has remained the same. For the two wheel tractors the price has always been about 25-30% the price of a new car. The top of the line 4 wheel tractors cost about 1/2 the price of a new car.
So given that the average price of a new car is about $30,000, that new 2 wheel tractor costs the same as it did in 1970. If Gravely still made a 4 wheel tractor, it would cost around $15,000