Could also be a distance thing... been awhile since I ran cables, but as I recall the limit is something like 100m? So if it's a larger dealership (in size) it may have just been easier to run fiber between two geographically distance switches.

As I understand it, as long as they are only using it internally (IE not distributing it) they have no legal requirement to release the source.

I know this doesn't exactly answer your question... but unless your machines are widely geographically separated, why not cut out the middleman and just get a hard drive and a usb2 enclosure? You know exactly what you are getting (instead of all the debate about "real world" performance). Sneakernet ftw

DD-WRT bandwidth meter:
August 2008 (Incoming: 17734 MB / Outgoing: 3549 MB)
July 2008 (Incoming: 12001 MB / Outgoing: 4202 MB)
July 2008 (Incoming: 12001 MB / Outgoing: 4202 MB)

Most of that is just from me - music/movies/linux isos, etc. I do have a roommate but youtube is about as bandwidth intensive as his use gets.

You would have to use a LOT of bandwidth to hit the 250gb cap comcast reported the other day. I download a lot and I'm not even at a 10th of that cap.