@StarsInTheWind
Looks like two heavily bred four-digits were sold for 20kn each recently (presumably; they're off of the recruit board and gone from the owner's village). An unbred dilute one was auctioned for 37kn recently. I also know one was traded for a cat with an Inverse white spotting.
They're pretty valuable and will only become more valuable as time goes on since no more can be made. It's a bit of a niche but some people enjoy collecting special or low IDs and will pay for them.