RAn,
At one point in time, the Catskills were a destination point, and The Concord, the Monster was the competitive center piece amongst a smattering of golf courses.
It was big, bold and was offered as a challenge to every level of golfer. It also provided a good caddy program.
For a while it enjoyed a lofty position, and a lot of attention.
But, as the interest and condition of/in the hotels and the Catskills evaporated, so did the desire to play the golf course. It was too long a ride, prices were ridiculous, conditions deteriorated, you were treated shabily, and interest waned.
Had gambling come to the Catskills, not Atlantic City, I would guess The Concord would have been given a face lift, had money poured into/onto it, and it probably would have retained a relatively lofty position.
There may have also been an evolving bias against commercial or hotel affilitated courses in the rating process.
But, you provide the basis for an interesting question.
How can Pine Tree, go from a top twenties course, to off the list, to back again at # 86, when physically, very little has changed in the golf course over the years. Top twenties is more than a strong endorsement of a golf course. What happened ? The golf course and its values didn't change.