It's an interesting proposition at this point in my life.
My 60th birthday is rapidly bearing down on me (I can NOT believe it . . . .). I no longer gig, or even entertain any notion of it. To be fair, it's barely a hobby at this point, but after so many, many years, I'd admit to finding it strange to be bass-less.
Eight years ago, I gave in to my one case of collecting-itis, and rounded up all three versions of the BB5000 Yamahas, all in matching white. I enjoyed them, but ultimately sold them all and never missed them, which told me a lot about me.
I'd long since passed the 'object of desire' passion about basses, they were all tools which I enjoyed and took care of, but they were no longer mental centerfolds. Maybe the Yamahas were my 'middle age fling' . . . . but I took the money from their sale and put it in other things.
Maybe it was a subconscious reaction to distance myself from a dead-end street (most of my playing 'career'), but I find that at this point in my life, new experiences are far more important.
Which leaves me with the two Alembics, which I'd never sell. Ultimately, there's nothing else I want or need, and replacing them would cost way, way more than keeping them, obviously.
But I'd agree that barring any compelling money need, I'd sit on them. I have lived long enough to know that another axe does not, for me, spur some flash of inspiration or a reason to stay at the wheel.
Joey