Well, it's not exactly unique. A-10, West Coast, they only play basketball, granted, not as good as the Big East. And one could argue that being unique is a liability because it's an old model which may not work any longer.
The Big East had 6 programs ranked over 100 rpi, including Nova. Take away the top 2 programs any given year and it purees. If the Big conferences can pay programs $100 million a year, they can afford to pay a basketball program a fraction of that which is still more than what the Big East pays.