Courts don't appreciate having their time wasted. It's going to be a lot easier for a court to dismiss a frivolous patent troll than to "assume guilt" and go through the absolutely hellish process of extended litigation.
Pardon my ignorance, but why, then, is East Texas considered a hot-bed for these types of lawsuits? Are the judges there an exception to the rule about not wanting their time wasted?
(Source: Worked as a litigator for 7 years.)