Would frequency response of cartridge determine purchase?

Recently purchased new un-open Clearaudio Virtuoso V2 and found upper frequencies from 5k on to be 3db

above flat frequency response. If a system is very revealing this extended high frequency would be very

audible. So why not have frequency response of cartridges known to buyer before purchase! Yes I am in

a bad situation with forking out big bucks and hoping for huge a upgrade! Cartridge is at distributor and am

waiting for test results. Just curious why such a unit would leave factory in the first place.