People expect things to be a certain size.
Things need to be a certain size to fulfill their technological requirements.
If those two sizes are not equal, they add empty space.
You can buy tiny CD players that sound great. The playstation one is a good example of a quality CD transport. Some people claim they are amazingly good, but in the very least, they are quality, and work as a very effective and good sounding CD player. But because it isn't 19" rack size, with a black or silver face, large display, and front loading tray, people don't think of it as a home audio CD player. Companies have to pander to your expectations, regardless of technological needs.
Of course, if they knew it was going to be purchased by an audiophile, they'd probably put in a giant toroidal transformer, and four 10,000uF caps, just to convince you that your money was well spent.
It gets really out of hand when companies add weight to cases by screwing random blocks of steel to the inside of the case, to make it 'feel' high end. I forget the exact model numbers, but people have occasionally discovered this marketing/deception in their gear before!
peace,
sam