Well, I agree, sometimes the machine is disassmbled in a way that harms the
components, or vital components are thrown away/re-cycled because 'they don't
seem like they are useful/valuable' (case in point, cables - people save the
boards, and throw away the cables - as a result of which, for many boards, we
have more boards than we need, and no cables).
Or when the previous owner thinks he's traced the fault to a module -- say a PCB
and throws that away because it is useless ARGH.
(a) That might not be the fault
(b) Even if it is, it can probably be repaired or used for spares for some other
machine.
-tony