$10,000 is a lot. It is not hard to remove and change the rotor. Two guys, a forklift/bobcat/loader tractor, a bar to pry and some 1x's to slide it out on is all you need. Check out prices from Precision Farm Parts or Sunnybrook Welding, will most definitely be less than $10,000.
I have a R72 with a Sunnybrook (similar to the PFP and CDF rotor) and a R72 with the standard rotor. IMO the staggered bar enclosed rotors can overthrash and build up material on the cage, also we had a tad bit more loss with the staggered bar enclosed rotor but negligible on both rotors. The original open rotor will vibrate more due to material getting under the bars and causing it to go out of balance. Capacity is better with the enclosed rotors, as well as it grinds up the straw more.
I'm probably in the minority here, but I would not replace a perfectly good standard rotor with a CDF/Precision/Sunnybrook, because I don't think the payoff is there. However, when the time comes where you don't think the original rotor is performing or if you run a rock through or whatever, then I'd not hesitate to go PFP/Sunnybrook on the second go around.