Because it's a statement about the financial viability of the device post design. If it's sold at a loss, the company loses money every time they sell one. That means you (as a business or investor) want to see lots of software sales to justify the expense of the machine. If it's sold at a profit, every sale is money in the bank. The response from investors to "10 million sold" is going to be very different if that hardware is sold at a loss over sold at a profit. Taking your film analogy, every DVD sold is sold at a profit. The cinema makes money on that DVD to recover the expense of creating the film and eventually in adding to the company coffers. The disk isn't sold at a loss regardless how much was spent on the film.I'd say it's almost a given that 'sold at a loss' means everything from R&D to marketing to the actual product. Because why shouldn't it?