You can always count on Hunch founder Chris Dixon for interesting Tweets.  He just sent out this one:

turns out patent trolling might not pay. Intellectual Ventures has negative 78% return.http://bit.ly/bSfamC

The link is a PDf download of a document from the University of Texas Management Company listing all of its private investments in venture funds and private equity funds, along with their internal rates of return (IRR). One of the worst performers is Intellectual Ventures, the patent portfolio fund started by Nathan Myrhvold that has a reputation for patent extortion. One of its funds, the Invention Development Fund I, has a negative 73 percent IRR (Dixon mistakenly thought it was negative 78 percent, but close enough). Another fund, the Invention Investment Fund II, has a negative 10 percent return. The two funds combined are delivering a negative 36.66 percent IRR for the University of Texas. → Read More