The musicians who gig with Alembic basses do not play on a basses that costs $20,000.
Perhaps not the musicians who gig with Alembic basses at Joe's Bar on the corner of Podunk Street and Nowhere Avenue...but if you price out the Series I or II basses that musicians like Stanley Clarke or Jimmy Johnson or Mark King gig (or gigged) with nightly, they're in the $15-20k neighborhood.