One of the greatest joys of my synthesizer life was having a used Prophet 10 in the musical instrument store where I worked 15 years ago. The owner let me stick around after hours to play it whenever I wanted. I hate to tell you how much we sold it for*. If I wasn't making musical instrument store wages then, I would have snapped it up.
I think that every so often, a maker needs to build something magnificent (like the Prophet 10 or the Voyager XL), and just let it all hang out, even if few are sold. That we, people look back and remember, and go, "Woah, they made that thing."
* $1600 USD, including an Anvil flight case that would probably cost $1600 now.