Right, but I think what infinitelo is referring to is a company that has an IT department, but that company's business is not IT related, either in product or services.
The consulting firm I used to work at did what you refer to--we sold AS/400's because they generated demand for our services in both the config/setup of the hardware, but also for us developing custom applications or selling commercial apps to them. We made very little money on the hardware, if any.
Now, I develop for a former client, and we tried to sell some of the friuts of my labor. We realized that we're either in the software business or in the widget-making business, but not both. So we just write off my time as the cost of doing business, and hopefully I can show that it's cheaper and better for me to develop in-house than buying off-the-shelf apps.
In this way, I can show 'profit' for our department in the same way my wife 'saves' us money by buying the $200 dress that was "$50 cheaper on sale"
--Jim