Conservation issue - shrink-wrapped manual

Well, I don't fit into that category, but I'll give my tuppence-worth. I know the feeling... About 25 years ago I managed to buy a shrink-rapped rare HP manual at a user group sale (actually the HP71 service manual). I amazed everyone there by immediately ripping off the shrink wrap. People told me that I had lost significant value by so doing. My reply was simple : 'I bought this manual to learn how to repair HP71 calculators. Not to look nice on the shelf. The value to me is the information it contains.' I guess if you have multiple copies of the same manual, or it's available on line and you don't mind reading it that way (personally I much prefer a paper manual) then there is no reason to open it. Otherwise, I say that a manual is there to be read. But then again I feel that old computers should run, even if it means putting replacement parts in. -tony