PointOfLaw Forum: Why is the Eastern District of Texas home to so many patent trolls?

It's well known that patent trolls forum-shop to get their cases in the Marshall courthouse of the Eastern District of Texas, to the point of setting up empty offices in the neighborhood to create venue. But, surprisingly, I've never seen a complete explanation written why. Let me do so. 1) Only two judges sit in the Marshall division. Correctly or incorrectly, they are perceived as judges who rarely grant summary judgment, and let...