I used to shoot 4 x 5 exclusively. Then I fell prey to digital, and have been digital ever since...though I still use really old lenses with my Nikon. Simply don't make them as good as they did in the 70s, I think. And I don't need auto focus, or TTL metering for stuff that isn't snap shots. I do miss that 4 x 5, some days.
You seem to like high contrast. I'm on the other end. I like real low key, low contrast. Unless it's portraits or commercial work. And yeah, selling it is the hard part. Or, more to the point....selling it for a good price, lol.