You keep thinking of it as a bass guitar, which is where you're going wrong and getting all confused! It's not MEANT to be a bass for someone to buy and play. It is 1) a piece of sculpture based around a bass guitar theme, 2) a "collectable" one-off item, and 3) a piece of marketing.
That's not to say that it's not a stupid idea but, as others have said, there are fat walleted collectors who would lap up that sort of thing to put in a glass case in their collection - as an objet d'art. Frankly there's a bit of me that's surprised that they're only charging 5k... That sort of "art piece" could probably go for 20k to a well-heeled Warwick enthusiast!!!
It's a mad old world!!