I feel this quite a bit. When I was young, I had a ton of time and no money to acquire the needed equipment. Now, I finally have the money to get basically whatever I need within reason, but no time to use it.

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.