At my last move I wound up tossing some stuff I really shouldn't have. So I hear you there. The one good thing, was, I was able to pick up a new customer, as they saw the machines coming in!
I guess it all came out in the wash for you. I swear as soon as I scrapped, threw away, or gave away, something I had not used in 10 years+ I needed it 6 months later. Before I made the last move of my life (I hope) and down sized I had a few pieces of equipment that had a bad weight to value ratio with scrap junk steel at $60 a ton. Some of it a pain in the ass to self rig with my limited equipment and others I would have to hire a rigger or rent equipment, making it a loss to haul it off. For $60 a ton who wants to self rig a 1950's oddball copy of a Hardinge HC to get $85? So during the moving sale if I had something I knew the prospective buyer loved, as soon as he started haggling I gave conditions on dropping the price, which was taking something that I would lose
money hauling off.
Moral of the story, I threw in a 3" diameter round of 12L14 a foot long I used to use as a door stop on some deal and forgot about it. I got a job from a current repeat customer just pricing material out at remnant price thinking I still had that chunk.
I priced the material at $25, a dollar a pound. I paid $160 to replace that chunk off an internet metal store, OOOPS!
If a person learned from their mistakes in this trade I should have an I.Q. that would make Einstein look mentally handicapped.