Linux, as well as other open source platforms, is just another business model. Because it was logically feasible developed and marketted. No royalties, no licenses. All you need is use it in your products and sell them in competitive price so that many consumers could buy. Just like Dell will do.
Dell, oddly enough, is listening to the many thousands of direct requests its customers made during its big public brainstorm (aka IdeaStorm) not so far back. The result of nearly 70% of participants requesting Linux on Dell machines? Linux will soon be pre-installed on consumer desktops and laptops outside their server and Precision desktop lineup — hoorah!