I agree in principle, but I don't see really how that applies to the following:

$300 for 8-core processor, $300 for single processor server motherboard which fits into a standard ATX case.
That's about $125 more for the motherboard than I paid for my last desktop board, and I think a little less than I paid for my 4-core processor, but it's the only way I know of to get 8 hardware cores currently.

The only drawback I see at the moment is that this server board only supports x8 in the PCIe x16 slot. And I'm not brushing that aside as a minor thing.

Again, I agree with the cost issue completely if you're talking dual CPU (or more), or even if the motherboard required an EATX case (big $$$). But I would never suggest that for boxing.

The whole reason I even started this thread was because a standard-sized, single-CPU board existed.