I just returned from Sugarloaf Mountain in Florida. If I recall correctly, half the holes had elevated tees: 10, 13, 14, 16, 17, 1, 4, and 8. On a couple of holes you don't even realize how elevated the tee is because the drop in elevation is over as crest that results in a blind landing area below the teeing ground. There were also a number uphill tee shots, some pretty steep: 12, 15, 18, 6, 7 and 9. Not sure how a golf course could be constructed on that parcel without so many uphill and downhill tee shots being required. As others have indicated in some cases its dictated by the land. I don't see anything inherently good or bad in elevated tees. It depends on the particular hole and course.