Earlier quoted context omitted.
I've wondered along these lines too. There is clearly something else going on in the VC business beyond strictly evaluating company value based on ability to generate it directly. One factor I'll project (since I can't tell where you're based) is that companies with proven engineering staff in the Bay Area get a boost in inherent value just from acquihire potential. Bonus points for famous and connected founders, as…
Not sure how you define value but Quora is creating quite a lot of it.
http://www.quora.com/Interracial-Dating-and-Relationships/Wh...
and
http://www.quora.com/Dating-and-Relationships-1/How-do-Asian...
and
http://www.quora.com/What-is-the-worst-experience-youve-had-...
That right there is a whole lotta value.