GAS is of course as others have mentioned a common psychological deficiency fuelled in no small part by various media, forums etc. It’s a way of channeling our daydreaming into yachts and large houses for various people.
I think it’s easy to overlook though how the daydreaming/consumerism is just so much easier than actually developing artistry or getting off the couch. The lives “we” live are also such that work or unemployment take so much time that it’s hard to find the time and energy for the difficult things. Hours here and there we can take to post on forums, read articles and watch videos. All things that fuel GAS.
I have more lenses than I need. Mostly vintage ones that came with another lens I actually use and apsc glass that sees no time as I have FF.
I’m the least consumer oriented person I know, bar a few primitivists, and photography is my only even remotely gear focussed interest. I can definitely say though that I spend the most time looking at gear when I have little energy or otherwise feeling down.