“Used cars are not the supporting act; they are the profit battleground,” he said. “So the question is not: Should dealers build their used car business? “Standalone used car dealers will actually do this almost on a weekly basis. The CEO of Perth-based Westside Auto Wholesale, CJ Jayasinge, said dealers have to treat their used car business as importantly as their new car business. “What is key for dealers to really drive home in the used-car space is that buyers want quality and reliability.