In the automotive world (and no doubt others), an awful lot of less-than-brand-new vehicles are kept running using salvaged parts, for the mechanical bits and t

In the automotive world (and no doubt others), an awful lot of less-than-brand-new vehicles are kept running using salvaged parts, for the mechanical bits and the body and so on. And even in the computer world, in the old days it was nothing for someones's old, expensive-when-bought-new computer system to be retired and then become someone else's "new", far-less-expensive-when-bought-used computer system. Or for the old stuff to be raided for parts, and so on. So it's not at all a new concept, and places like eBay just help facilitate this process these days.