Trek is based in Wisconsin and the UW School of Business logo is at the top of the survey, so I'm sure there's some connection there. I agree that the brand-ranking felt a little strange, since I also own an "other." I finished the survey though because a. I own a Trek (though that wasn't my last purchase) and b. I'm a UW alum, so I felt compelled to help out a fellow Badger.
'09 Jamis Satellite Femme | stock Jamis Road Sport -- road
'08 Trek 7.2FX | Terry Cite -- commuter
'77 Raleigh Grand Prix mixte | stock Brooks (vinyl) -- just for fun!