I don't know, guys. I just sold a 9.8 for nearly $2,300. I sold a 9.8 last year right after season 3 ended and got 1,600 for it. I also sold a 9.6 double signed during the same time and got $1,200 for it.
Aside from a few deals here and there, the book has steadily increased every year for the past 8-9 years.
Big rule of thumb should really be don't sell books you're not okay with letting go on the cheap in the summer time.
I'm actually more concerned about the Saga C2E2 variant. I can't believe it's fallen as much as it did, considering popularity, and the scarcity of the book.