You're right of course, about the PCB's that
are of interest to you, but what
about the ones that aren't? I've often snagged boards, not because I knew and
wanted what they do, but because I knew and wanted what the IC's on the board
could do and I wanted that in my inventory. I once built up a very-wide-word
'ya mean like those really neat rotary switches that we got by scrapping
that German machine - think it was called something like "enigma" ...