I didn't say "negative value in Silicon Valley" (it definitely isn't), but, "Silicon Valley Startup world" (I.E. the first six-eighteen months when the technology is being built).
At one very prominent startup that I worked for, lead by some very, very well known executives (who are extraordinarily prominent in the valley today), there was a general position for the first two years of our company, "Hire no MBAs." They really believed that the MBA was a negative at that phase of the company's history, and were looking for Programmers, designers, coders, systems administrators, DBAs, etc.
At one very prominent startup that I worked for, lead by some very, very well known executives (who are extraordinarily prominent in the valley today), there was a general position for the first two years of our company, "Hire no MBAs." They really believed that the MBA was a negative at that phase of the company's history, and were looking for Programmers, designers, coders, systems administrators, DBAs, etc.