When I was a youngin, the Mavericks went a decade without a playoff appearance. In 97-98, they averaged only 13k in their stadium, 26th in the NBA. They're one of the most valuable franchises because ownership said that making the playoffs regularly and putting good teams on the court was a way to get fans into the stadium, get fans tuning in, and take advantage of a large media market. Cuban specifically bought that team because the team was undervalued after a decade of poor performance.