I have always bought MF camera/lens by buying only those that need service, or factoring in the price of a CLA. This has worked well for me and none have ever been back to the shop (one did take more than I planned while at the shop). Some pieces are going on 15 years.
It's never made sense to me to buy pretty and old for a big price, I like them with some miles, needing service, and ready for another long career of shooting.
Concerning the Kiev's, as several have already stated, the price collapse of quality used MF gear killed their niche.
Mike