The closed system approach almost put Apple out of business once before.
Apple only sells the high end high-quality product, and makes more money than the HP and Dell combined.
That's what they kept saying about the Mac, back when they were almost put out of business the last time.
Because the hired a CEO who took them out of their business model. They even experimented with your advice and licensed the OS for more "open" system business model. Big mistakes.
They're back using the winning formula. They still have to innovate and build high quality products, but as this article illustrates, so far they are doing this with the iPad.