A $900 MacBook Air would probably have lasted far longer and needed less time troubleshooting than a $500 computer made with subpar components. The amortized costs are far lower with Apple products (or other products using higher quality components) compared to buying the cheapest devices made with the lowest quality components, so there is no point in comparing the two.
And most people only need 1 computer, if that. I would actually bet most people can do everything they need to with iOS and an iPad would suffice. And other than the smaller screen size, I can see people make do with an iPhone even, especially if all you are doing is consuming.