Also, what Drinax is selling is not only Drinaxi art, but the art the Sindalians collected from all over Early Charted Space. The collection is described as being,
"Now, between all the possible fields of creation and study, from sculpture and painting to weapon-smithing to astronomy to molecular biology, let us assume there are a dozen such masterworks in every generation across a single planet. These masterworks are things of such staggering genius that they will be remembered for centuries. A dozen from each generation of artists and creators... from every one of thirty worlds that owed fealty to Drinax... for more than fifty generations. If you take, say, the ceiling of the Sistine Chapel or Taj Mahal as your baseline, then the Floating Palace of Drinax is crammed with around 20,000 such works of staggering genius, along with ten times as many lesser works and treasures from across the stars. Add onto that all that they looted from the Sindalian empire and from other worlds, including the Ziru Sirka."
So, no. These items are not prized only by Drinaxi. They are prized by anyone interested in historical art. Unless you think the Sistine Chapel is only appreciated by Italians?