There is obviously some sort of a market for them!
lulz.. its called the enterprise sector. And that sector is about 10x larger then the consumer sector your used to.
Were in corporation territory with massive amounts of funding for there IT.
And usually those are reviewed on entire system packages.
However i have done a few Xeon reviews in the past.
But nothing too spectacular.
As for Opty's, you can google MC reviews everywhere.
As for overclocking one, not without pissing off AMD.