On the topic of breaking them down, do we know if most buyers are touchy about heatsinks? I don't tend to have an issue with them but every so often there's one with a huge sink and the screw is tucked back behind some components or is riveted on and won't come off without snapping the board. I have avoided stripping them for this reason, as I don't want to spend all the time prepping the various parts, only to learn that leaving Al on the board has totally devalued them. Also, the payout for power supplies is roughly the same for low-mid/low-grade boards, which seems to be most of what they offer, so why cut away more paying material? But I don't know much about these; I do mostly laptops.
I concur with mike and sledge about server PSU's. They are remarkably high grade, if one takes the time to prepare them properly.
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