Most of the places I flew R22s seemed to just get rid of them at 2200 hours. I'm sure they didn't just throw them away (though who knows there certainly are enough of the little buggers around) but they did just replace them with another used (or freshly overhauled) one. Either way I never saw the same 22 twice at one school.
Perhaps when there are as many G2s out there as 22s and schools can just lease another used one, the per hour price will finally drop to a more reasonable one?