I am a firm believer in "the right tool for the right job". I also have exceptionally high standards for the quality of tools I purchase.
That said, as I've grown older, I am no longer tempted to buy things either because "they might be useful one day" or because "I could have used that in the past". Moving a workshop is intensive, and I'm now working to reduce duplicates, worn outs, and lower quality tools no longer needed. I do, though, continue to make annual or semi-annual slow walks through the big box stores to survey what new fangled contraptions have come on the market, but only as a mental reference point in case I discover a true need in the future.
I have one exception... old hand planes. Even there, though, I restrict my purchases in antique stores to only a size or type which I know for a fact I can and will use. I've run across some gorgeous antique, Swedish hand-made long planes, but since I truly have no need for them, I can't justify the $$ to just hang them up on display or for the sake of knowing I own them.
At the same time, my wife has seen my altered approach to tool purchases, and now is no longer a challenger on a purchase, but rather encourages me to get the things I say I either want or need because she knows it will have genuine value for us. Along those lines, her only remaining challenge to my pending $$$ purchase of a Powermatic Model 72 table saw is waiting until I truly have the room for that monster.