Your brother wants a Mac in no small part because he can't afford one. It's a status symbol. Ferrari make ridiculously unpractical cars that they refuse to sell for cheap; same thing with Apple, especially in the latest iterations. Advertising and society tell one that wealthy and hip people use Macs, and one "decides" he wants a Mac.

If your brother really needs OSX, he can go second-hand (I use a 2012 retina model, still works great); if he needs general computing, there are tons of equivalent alternatives at cheaper prices. Apple is never going to sell him anything for cheap because it would damage their brand.