You're not being an ass, I can even see your point somewhat. But I've found with my Karma that I started using USB2 more for file transfers just because the 100base-T ethernet isn't as fast. Gigabit ethernet is then the next logical step, even if most (if not all) hd's won't be able to satisfy it's bandwidth hunger. But I'd rather have my harddisk be the weakest link in the chain than my NIC.
For some reason I also prefer ethernet over USB2, so I'm not all that happy that I now have to use USB2 to get "full speed" with my Karma. But I do, because speed is a factor that weighs in heavy for me. I want to wait as little as possible for file transfers to finish.

An no, we don't NEED to be able to fill 80gig in 30 minutes, but it sure is NICE if you can. Last time I completely re-uploaded all my files to my Empeg it took me two days, which is a bit too much IMHO.