Though I frankley find the links annoying, they are not near as annoying as a Nissan Titan driving through my screen as used to happen.
If that's what it takes to keep this system free, I say go ahead.
As far as people thinking you are actually "sponsering" a particular vehicle brand because it is linked to your writing, the link only shows up on the first writing of the word, so end your diatribe with this:
"I do not support the linking of my writings to: Jeep, suv, mini, toyota, chevrolet, ford, nissan, hyundai, mazda, kia, volkswagon, yugo, saab, volvo, jaguar, range rover, ferrari, chrysler, mercedes-benz, audi, bmw, 4x4, grand cherokee, liberty, or any others who wish to link their name to my posts."
States your point, and gets rid of the links for the rest of the posts.