They relied primarily on trade as a method of survival and placed great emphasis on maintaining good relations with their buyers. Consequently, even an accusation of wrongdoing could end the career of an Entharan trader.
They were encountered in 2374 by the USS Voyager. The crew attempted to buy goods from Kovin, a weapons trader. Unfortunately, an accident during a demonstration led Seven of Nine to wrongfully accuse the trader of mistreating her. Sadly, Kovin was killed before the mistake could be rectified. (VOY: "Retrospect")