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Unfortunately, your resale argument doesn't apply to me. I run a household network with a collection of PCs of various ages. I don't resell my computers; I move them down the food chain to lesser uses. Eventually the oldest, slowest ones fall off the end of the chain -- but by then, their resale value is zero, or close enough to zero so as not to matter.
At the top of the chain, some of the computers run Windows, because I have some applications that require it. All the rest, the servers that keep the network running, use Linux.