Several years ago, I looked in my parts warehouse (AKa- 1 1/2 worth of my 2 1/2 car garage) and decided to throw out most of it. I try to keep some stuff, but I agree with most that it's not worth keeping a whole lot of crap. For one thing, You can never find what you need even if you have it. And if you do decide to look for something, is it worth rummaging through boxes of stuff for hours looking for something? NO. I ended up always buying something, easier than looking for hours. that is why I purged.
So what do I keep............ I have some oddball motors, some timers I have been stuck with, and a little assortment of other stuff. If something is on sale, I buy in bulk to save over long term. But compared to what I had in there several years ago, it doesn't compare. I now use about 1/2 of the 2 and 1/2 car garage. Guys, you feel relieved after you purge all of the old stuff you can't for some reason throw out. Try it, you'll like it.