I can produce some pretty 3D graphics of a completely unrealistic design.
The auto manufacturer is well know for having amazing looking sketches of these cars that have huge wheels, slim tires, no wheel well gap, amazing angles, beautifully uncomfortable looking seats, and when they come to the market you can kind of see influences of the sketch.
Why waste my time on making these impossible yet pretty designs?

Advertising, and PR is much more than handing out business cards and Brochures.  These amazing designs can catch the attention of someone who’s never seen your products, and who had no interest them.  They’re attracted to this design, and will look at your other products.  If your product really sticks with this potential customer they may find a reason to use your products or even recommend your company to another person.