Maybe if they made the download of HD video optional instead of forcing everyone to download HUGE files, it might go someway to helping people with lower bandwidths.
It's very unlikely that'll ever happen, and for once, believe it or not, it isn't PD's fault. *Shock, Horror, Gasp*
Why, well, the manufacturers designing the car want you to see the movie as it not only promotes the brand more but it offers an insight to how the design process is unique to their brand and what influenced the design. For instance, the Chaparral VGT's video went on for a while and that's because Chaparral wanted to get it's brand out there to the younger audience who were probably thinking, "Who the heck are these guy's?!?". Now, say Peugeot
(purely an example) makes a 30 second video just showing a few shots of it going around a track. Not very interesting. If you were running a car manufacturer firm, which one would you make?
Obviously you'll make a longer, more interesting video as it will benefit the brand by boosting the brand's image globally.
Yes, the HD isn't really needed but if you want to make your game look more appealing, you're gonna go for the best quality (or one if the best quality) image/s which is, HD.
Look, this is coming from someone who doesn't support PD, but it's the obvious truth and it needs to be said.