Maybe because there's a sort of misunderstanding that an expensive, exotic bass will make one a better player and once the buyer realizes that isn't the case - they sell it and return to playing their non-boutique bass. It also depends on how one thinks of the term "boutique". There are basses in all price-ranges, from cheap to expensive but not necessarily 'boutique'. Terms like "pro-level" may be a better handle for a bass like a Sadowski and/or Lull that is not really exotic, but is more pricy and used by many pro's.
This is an exotic boutique bass in all respects. (Ritter) Will it make you a better player? Will you play it at your local blues dive? ah.., no on both counts.
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Or how about this ESP limited edition bass 6? Only $32,990.00 (w/HSC)
ESP Exhibition Limited 2023 EEX2328 EXL OM Bass 6 - Natural/Ocean Blue - Eddie's Guitars