Would you/we ask the same questions of Fodera? Or Alembic? Or any other high-value/low-volume bass maker?
I've got a Wal**, an old Pro that I was lucky enough to pick up back when they were as cheap as chips. Obviously from a purely fiscal point of view I'm very happy that its value has gone through the roof, but on the other hand it's a real shame that -- barring a pools win or a substantial dip into my pension lump sum -- I will never own the Mk3 5-string I'd so desperately love. However, it is what it is. I think it's entirely up to Paul and the Wal crew how they want to run their ship. If their current business model is sustainable and comfortable, then they have every right to keep it that way.
** and guess what, I'm neither a doctor nor a lawyer and can string at least 3 notes together. Ain't stereotypes great?