I’ve not seen any Masterbuilt basses for sale, as new, but the electric guitars can be £5 - £6.5k on the Coda site. Second hand I’ve seen them around £3- £4k depending. There is a TB topic that has them pitched at $8k.
Fender did replace the neck on the new one. Actually I remembered after that the other was a warped neck, not the truss. The shop denied it, crazy. (BTW I spent 16 years in the trade, including Fender, so I knew my onions).
Yes, it does make the Ray Special seem cheaper!