Apple's approach is to make money. Those open system manufacturers lose money on the low end, that's why the work so hard to get you to upgrade and upgrade and upgrade before you leave their website.
Apple only sells the high end high-quality product, and makes more money than the HP and Dell combined.
Fixed that for you. HP and Dell each make more revenue, but not as much profit (lower profit margins).
And of course Microsoft makes even more revenue AND more profit than Apple, both in absolute dollars and as percent profit margin on revenue...;)
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.