Have you seen the price of it?
http://www.speedforsale.com/index.php?specificmakemodel=Nissan GT-R R35&pid=50#body_info
Rakie touched on this a little too..
But ^^ Most important about that car is the rarity and "Ooooo" factor. In hopes that people saw your car, remember your business had it and in turn remember your business name. To those who don't understand remember it was bought as a show car by a business, not by a private person who wanted the most bang for the buck.
As far as what the whole import scene is all about. You can't narrow it down to one thing that people do with imports. There are various smaller scenes within the whole "import scene" where different people have different objectives.
Another thing alot of people not in the import scene will realize is there's a whole "jdm" fad that's been going on for a while. Where people pay big $$$ to get their hands on parts that are only sold in japan and their main goal is to make their car look as much as the japanese counterpart as possible. Something that Zerg's business helps aid people in doing.