Yes, I have worked in retail electronics. Markup varies by product an at times maybe be negative. yes, take a loss on a product only to make it up on another. Look at the printer industry. A $50 printer that comes with two cartridges is cheaper than buying the two cartridges. A $200 cellphone with out service plan maybe sold to you for $50 with a service plan.
I think in the computer industry the average is about 10% for systems and system components.
Oh, for you GameCube, Xbox, Playstation owners, the markup on your games is about %50. It ranges between %40 and 65% on new games depending on title. I'm amazed they don't give those systems away.
I thnk you'll probably see them being sold for about 600 Euros