Are the really pricey HT Pre Amps worth it?

Looking at a pre amp upgrade.  Are the real expensive pre amps better than a Marantz AV8805?  With prices $12k plus for even used high end pre amps here, are the extra $ really worth it?
Currently have a 11.2 Atmos config.  Marantz AV8802a, 2 monoprice (ATI) amps, Oppo, Sony 4K projector, etc.