To be perfectly honest, I think the majority of the value to be made from GC is from perusing the archives using the search feature. Posts go back over a decade, and many prolific players have contributed at one time or another, often with valuable or at least historical interesting content (that may be helpful to observant and clever players).
To be clear, I intend no offense to Al, just as I mean no offense to Ken when I say that the major utility of this site is the same. Many of what I would consider to be the most valuable posts on this forum date back several years and will require the search function and some rudimentary Internet Detective skills to locate.
That said, I check both sites with regularity and have no plans on discontinuing my GC membership, despite the fact that I'm not very active on that forum. I also suspect that many members make their membership fees many times over not in valuable information posted directly on the forum but rather in the form of EV gained by networking and sharing information privately with other players on the site.