I don't mind trailers at the movie theater because I actually like them, and you can always avoid annoying commercials at the theaters if you arrive closer to the scheduled showtime for the movie.
But on DVDs and Blu-Rays it just annoys me. I paid for the product, why do I have to watch dated commercials anyway? I also love those montages that Blu-Rays have on them showing how awesomesauce Blu-Ray is. I bought the fucking Blu-Ray, I know Blu-Ray is awesomesauce. YOU DON'T NEED TO TELL ME.