Yes, the Sun are fairly unique, as their facilities costs are lower than most. Being in a casino also helps boost attendance because an indoor sport played during the summer isn't very appealing in regions where it gets cold in the winter. That notwithstanding, people go to the casinos year-round. Finally, the Sun have a number of UConn alumnae on the roster, and it's unique that there is a nearby WCBB program that a) has enough WNBA-caliber players to feed into that league and b) is popular enough that people cared if they did.
Two other teams declared a profit in 2011, per David Stern, though he didn't specify who they were. Their model may be one other teams can emulate.
