Tom,
I've been to one GD panelist gathering, in Orlando five or six years ago. It was held at Grand Cypress. As you indicated, there were a number of well-known architects speaking (Fazio, Dye, Jones, Nicklaus, Palmer) and we played one of the courses. After playing, Ron Whitten used the course and a number of panelists' ratings as a training exercise. The fee for the event was totally in line for what we got in terms of the hotel room, food, and so on. The course was okay, but not a serious contender for anything. In no way, shape or form was the event designed to drive ratings for any course or courses, and I can't imagine that Golf Digest made a whole lot of money from the thing after all of the expenses they had to incur in the process of bringing in their staff as well as the guest speakers.
Follow-up trainings were primarily very short events - fly in and then out the next day, with no golf on the schedule. I believe there have been a couple of other multi-day events, but again, driving ratings or making the big bucks couldn't possibly be a driver. There was one event held at Pinehurst a few years ago. I did not attend, so I don't know what golf was involved.
Tom, I can't help but believe from my very limited view vantage point, that Golf Digest isn't profiting from the process involved in developing and producing the ratings, especially after paying the staff that's involved. Instead, my guess is that their profit is coming from the buzz and the resultant magazine sales, and that's nothing different from what you and others have heard from their management about the whole thing.
I have participated on a couple of conference call trainings, but that would only have cost Golf Digest money to conduct. There has not been any pressure on me to attend any trainings in person anywhere for a number of years now.