Woah, there pards,
Let's get this straight, the par 5 course (par 90) is only there if you are looking real hard for it. Playing the course normally it is like any other course with the possible exception of the small alternate fairways used on the par 3's. You might just wonder why that turf is over there???
It's MARKETING. That's all. This place is still relatively in the middle of nowhere and they just figured it would be a kick for a few special events a year to have a few guys with the cajones to go out and have at it. Have some fun playing 18 par 5's. Would be fun for some, not really me, but certainly for some.
As for the extra turf, maintenance, the "message" it sends, etc. geesh, it's not really that much more turf and the whole thing is really low key with some carries involved from the regular tees. From the par 5 tees it is really a long carry to get to green grass so its not like there is an exorbitantly extra amount of fairway to fertilize, mow, etc.
So, Brad, your calculations don't approach the reality here because the extra 1,200 yards you wonder about come in the form of these extended carries for the par 5 course. Think about it like a course overlaid on top of another course. Now that is unique, plain and simple. Don't attack this course or this concept til you've seen it. I have seen it twice and it works. It shouldn't be the model for future projects because that doesn't make sense for most sites or programs. But it does make sense here - look at the space in that google aerial taken before the course was grassed.
I don't have any real reason to stick up for this course or this concept other than a friend of mine designed it. You can all make your own decisions based on seeing it or playing it. But you must admit that it will garner attention and that, I think, is the primary raison d’ętre.