Evaluation, comparison and establishing relativity can only be accomplished through diversity in the sampling.
I think this is questionable even in the examples you mention. Many love their mother's cooking till the end, no matter what else they have tasted. And those that never taste anything else die thinking mother did it best . . .
But even if your point holds true, it is a matter of degree, isn't it? Once one has played enough to figure out what one really enjoys, then why not settle down and enjoy one such course or a few-- provided the course can hold up over time. What is the point of continuing to galavant around, then? It cant just be to continue to build a basis from which to judge, can it? At some point, one certainly knows enough to make a judgment.
For example, I did this for a very long time. Hopping from course to course almost every weekend, driving 3-4 round trip in the hopes of finding something I could live with week after week. But I stopped, or at least slowed down, once I found something. Galavanters never seem to get to the point where they can stop and just enjoy the game.
So why do you guys do it? I mean even after you have seen enough to have already developed your tastes? I am starting to believe Bill Maher; its not anything in particular driving this, just newness.