I'm at the point myself... GAS got me into buying a couple things I haven't used enough to justify keeping them. Sure, stuff I may love what it can do, but with what I've spent vs the amount of use... Yeah, I'll be selling some stuff.
Going to keep the medium format stuff (none of it has any real value) and my Graflex setup and whatever 35mm gear I may have around (few gifts, worth no real value) and just sell the accessory lenses, extra cameras, and accessories that I've gotten and never used.