Genghis has it right.
I interviewed Frank Robinson about this a year ago. (In fact, the intergalactic scoop that he was considering stopping production of the R22 came from that interview).
In Frank's words, the R44 Raven 1 would make the best trainer ever. "Flown as a two-place in training it would have big advantages in performance, autorotational capabilities... with the hydraulics it handles really well. The Raven 1 would be a much nicer trainer than any helicopter ever - better than the Bell 47, the Hiller... and safer than any helicopter flying, even in training.
"It would still be cheaper than a piston Enstrom. It would be cheaper than the Schweizer 300C with comparable equipment. Matter of fact some of the stuff you get as standard on the Raven, like the governor and the rotor brake, you can't even get on the Schweizer as an option. It would be a little more than the Schweizer CB, and of course a lot more than the 22 - the capital cost is greater, and it uses more fuel, but the insurance rates for the Raven 1 can come down below those of the 22, even in training. The 44 with two people in has a really great performance margin. You'd have a reduction in training accidents - fewer per hour flown."