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Even if that was the case, assuming nothing bad is going on, there has to be a reason all these cases end up there. It's too frequent to be a coincidence.Fifteen-plus years ago the Eastern District of Texas developed a reputation as a good place to litigate patent cases because at the time it was a fast docket (not so much any more, because of all the patent cases being filed there) and the judges there have come to know patent law pretty well, which is welcomed by lawyers for both sides.
In a 2010 article, Stanford law professor Mark Lemley, who is known for his careful statistical analysis of patent cases (and is cited amazingly often by the Supreme Court), noted that the win rate for patent owners in the Eastern District was 40% [1].
In a 2013 article, Lemley concluded that "... the patent sophistication of the jury pool had no statistically significant effect on trial outcomes." [2]
[1] http://amlawdaily.typepad.com/Lemley.pdf
[2] http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2217690, page 177, text accompanying note 24.