IMO is all demand.  Brahms p.c.  are very well know and wanted,
and Zimmerman is already a pianist of cult.  It is not the rarity of
a recording but the demand.  I've extremely rare things but very few
hunters of rarities like me, want them, Who will pay big money for
Hermann Scherchen SQ op.1 or Ysaye v.c.No.9?

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