Billions more? (Update to "Is SL worth $5 billion?" post)

The mystery deepens: Yesterday a Linden PR rep wrote me to point out that the reported 10% of Linden Lab sold by investor Catamount Ventures for $500 million represents 10% of Catamount's holdings in Linden Lab, and not 10% of Linden itself.  So once again, simple math suggests that half a billion bought less than 10% of Linden/Second Life-- and therefore, if Techcrunch's original source is reliable, Second Life is worth considerably more than $5 billion.  As to how much of the company Catamount owns, the Linden rep declined to say, deferring that question to the investor.  Discuss here.