By the way, welcome to Apug.
Remember that the RZ is a very good and reliable camera. The manual says that every 50,000 pictures you should have the camera serviced (whether it needs it or not). Many of the people who made their living using this camera have moved to digital technology. Because of supply and demand that means you can buy a very good camera for a fraction of what it used to cost. Because of improvements in the other technology the value of this camera is likely to continue declining.
I should add that I have an RZ II and several lenses. It is a joy to use, but now I prefer larger formats.
John