Ahh, the forum has gone econ 101 on us, very nice
I think as it pertains to golf courses, both of these principles are in effect.
Example 1: Two daily fee golf courses are relatively close to one another, say 10 miles, 16km for our international friends. While no two courses are alike they are similar in thier fun, variety, scenery, etc, etc. The main difference is thier price. One is priced at $40, the other at $60. I gotta say that $40 course is going to get more play.
Example 2: Two daily fee courses are close together as in example 1. 1 course is just OK and the other is clearly superior in every category. The OK one is priced at $30 and the superior is priced at $60. I think in this case if the local base and tourism support it, the $60 course gets the more play. And will continue to do so until its no longer deemed a better value, or worth the nice layout and such.
As for the "law of diminishing returns" as noted by Sean, I think this applies in pretty much every situation. There will reach a point, when you're just not willing to pay that $60 to play the course over and over again for a specified time period.