They have 17 courses, not including "best of" courses. The fair thing to do, would be to use 11 courses and never the same one twice. Fair to all clash clubs. There are 11 clash games per clash. Everyone would play the same courses, and never a repeat of a course.
When a club gets stuck on repeat at Merion, and another gets stuck on repeat at Wolf (back 9 especially), it makes a huge difference in scoring. We spent the first 24 hrs and part of 2nd 24 playing congo and oakmont only.