It's a big problem for photographers too. Especially with the rapid progress of mirrorless cameras there is always the next camera or lens you need to get. I have bought lenses and never used them. I have also spent more time on looking for accessories for my 3D printer than actually using it. Not sure how to combat GAS. I feel for people with a full time job it somehow compensates for the lack of time working on one…
I am typically able to resist the urge to succumb to GAS, but I don't always. I still have an incomplete atreus (http://atreus.technomancy.us/) in my basement; I set it aside when I bought a house, and haven't had time to revisit it since.