Now that The Deep is a Hot Zone, the prices of these on the Bazaar have dropped. They are generally offered for sale at about 150p in Maelin Starpyre's Bazaar, although http://www.eqecon.com/ lists the multi-server average price at 450p.
That is nowhere near the Tribute Value of 750p. Also given that there are better stat pieces available through the Hot Zone armor quests, it makes sense to use these for tribute nowadays.
Cheers,
BV