For those numbers guys out there this will make sense. Building another course at a resort is more cost efficient than a stand alone, for you are sharing resources for it's operations once built.
So the capital investment to build the course is certainly sizeable and needs to be recouped. One has to run the numbers of expected rounds using a standard distribution for estimated rounds within a 90-95% confidence interval. They could use their own courses to get a benchmark. I'm sure they have data on what the pricing tolerance is of the public and assign price points that utilize the course to generate the greatest profit.
Contrary to what many may think you don't just want to fill up 100% of your tee times. You want to maximize your profit and they aren't the same. For an easy example, let's say you have 200 possible rounds per day to sell maximum and you charge $200 bucks and sell 80% for $32,000 in revenue. You could price them at $150 and sell 100% for $30,000 in revenue. Which would you rather have? Of course you would like to generate $2,000 in more revenue. Let's take it a step further and say let's price it at $300 and only sell 60%, well that generates $36,000 in revenue.
This is a simplistic pricing model and it works when the variable cost is fixed.
The real value in adding additional courses is the sharing of services (proshop, driving range, restaurant, GM, maintenance crew and equipment, etc.). They have to hire additional maintenance staff and maybe some more equipment, but other than that adding an additional course presents many synergies that wouldn't exist with a new stand alone course.
So I would argue that resorts that share resources are better positioned than those who aren't for they can absorb the revenue variance better and produce higher in good times. This is after they recoup their capital investment of course, which is the biggest hurdle, especially if it was financed.