The 1st step would be to limit the pass to 3 mountains if the cost of the pass would be $600. And limit it to 4 mountains if the cost of the pass would be $800. This way each resort would receive $200 each.
3 mountain list:Blue, Elk & Sno
4 Mountain list: Blue, Elk, Sno & CB
I think if one of them got on board the others would follow suit.