If it's someone local or friend-of-a-friend, fine.<p>But for rando ebay/web: is there some part of the supply chain where thousands or tens of thousands of machines hit a single point where it's scalable for, say, a software rootkit to efficiently be put on them?<p>E.g., I know universities typically buy a shit-ton of the same model. Where do they eventually unload them if they don't end up selling through their official used channel? Same for police/govt/etc.<p>I don't think the economics of, say, rooting a bunch of machines in the hopes of hacking a big Bitcoin wallet need to even make sense. There just needs to be an easy point of access to many machines, so that a confidence man can <i>sell</i> some poor schmuck on the idea that if they buy a rootkit and install it on all of them they'll make millions in Bitcoins (or whatever).