I suppose it is because they are so popular and seem to be under the butts of half of the road cyclists out there. Personally I see alot more Cannondales than Treks around here (whenever I even see another roadie). I don't own a Trek but I would have no problem doing so. From what I have seen they are a good quality bike and a good value for the money. I agree with one poster who mentioned the Lance thing. I ride a LeMond and I have heard people say they hate LeMonds and wouldn't ride one because of what they perceive Greg said about Lance. I think people like this are stupid and childish.
Just my 0.02
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“A good teacher protects his pupils from his own influence. ”
― Bruce Lee