Comparing Mavericks to Windows XP?? Windows XP was released in 2001, fifteen years ago. Mavericks was released less than three years ago. Hardly comparable.You mean like going out and buying Windows XP from Microsoft
At some point software companies drop software from their offerings and Apple (at times) chooses a fairly aggressive time line, but they're not alone.
People have alternatives, such as buying it on eBay.
That said, you can still buy Windows XP, arguably from more places than Mavericks.
Mike