I agree with John Kirk on this one. As the clubs are currently constituted, Ballyneal and Dismal River are competitors. There are a limited number of prospective national members and both of these clubs offer the Nebrasaka/Colorado sand hill experience. They don't work together and each would gladly welcome a member from the other.
However, I also believe that they don't have to be - in fact, they are both so out of the way, they shouldn't be. If there was a cooperative arrangement between the two clubs, each could drive revenue to the other. I have to believe that if given the opportunity, a person flying into Denver would love to stay and play a day at Ballyneal on the way to Dismal River. Likewise, if you were at Ballyneal, I don't know why you would not make the drive for a stay and play at Dismal River. Kind of like a sandhills golf trail on the private side. It certainly brings more value to the members.
In addition, anyway you slice it, Denver is going to be the primary market for memberships. However, Denver is unique due to its hub airport. There are pretty cheap flights to Chicago, LA and Dallas - which could easily be "secondary" markets.