Far as I can see the never throw anything away syndrome is justified by the inversion of the 80 % : 20 % rule. That is only 20 % of the stuff you keep could ever be used, even under the most optimistic assessment. Question as to which 20% will get used is unanswerable in advance so hafta keep the lot. For creatively serious hoarders, like moi, the rule is probably more like 95 % : 5 % .
Closely related is the effort that we feel might "reasonably" be expended to make use of hoarded treasure. IFor example I need some serious shelving for the loft and have a decent collection of 1" square speed frame off cuts, a box of joints and a new pack of 12 ft lengths. A quick eyeball estimate says that the off cuts should be more than enough for the 125 ft (ish) total length but a fair number of actual lengths available make a poor match to whats needed. So I set up a jig and welded the short ones into longer lengths. Maybe splicing 1" and 2 1/2" long pieces into the middle of one four section piece was going a bit far but the 1/16" excess came off pretty darn fast on the vertical linisher so it worked out fine in the end. Off cut collection down to one 3 ft length and six 2 ft 6 ones with integrated welded on shelf brackets. Result.
Naturally we won't mention the saga of the "too good to use" assessment on block of alloy which caused me to buy an almost identical lump for a job. Which never got done! So now I have two too good to use pieces.
When it comes to values I suspect most of us had our mental assessments pretty much frozen around about the time we got our first proper wage packet. £50 per calendar month for me. Inflation and technological change leading to vastly reduced real world prices make that assessment a poor guide in the modern world.
Clive.