No one needs a Cadillac or a Rolls Royce. Or an SUV. Or... well, pretty much anything. There are cheaper cars that go from A to B at an average of modern town/city 24mph, and use far less fuel (for those who are cost sensitive).Noone needs a Mac, really. There are cheaper computers for price sensitive people.
Choice. Like it or hate it, that's what we get.
And there are those of us who, for example, are inclined to look at the whole-life cost of things, not just the cost to get it out of the retailer's door - and with resale values generally pretty high, reliability leading to multi-year use, and a great deal of free software bundled in, a Mac works out pretty good for price sensitive people too. Far less per day than a jug of home brewed coffee.