I would draw the line at €200. A lot of people can justify €200 for nostalgia. If you can run the old software and the hardware has the right look and feel, people won't mind the details too much. Far fewer people can justify nearly €800.
But don't worry. The C65 core is already being ported to MiSTer from what I've heard. So a small metal box with a USB keyboard experience isn't far away for many others to enjoy.