I wrote up a much longer response to begin with, thinking you were implying things when perhaps you're weren't, but if I take out the potential implications, your post boils down to "there are alternatives to Windows" and "most games require Windows", but those are stating the obvious to say the least.
Another way of looking at it is, think of all the interesting things you could do with the computer without the operating system!
So obvious you left out the existence of other OSes, which
do allow you to do many interesting things with the computer.
You can't do much without
an OS. But you can do almost everything but play modern commercial video games, run modern commercial content creation software, or run frustrating vertical market applications, with OSes that don't cost you money.
But, if you need to do any of those things, they will end up costing much more, either up front, or over the PC's life, dwarfing the cost of the Windows license. When the CPU matches, at worst, but typically dwarfs, the cost of the Windows license, and the GPU does the same, then the set of games do the same, how is it that Windows' price is a particular problem?
See if you can get windows 8 but with the option to use windows 7. Then just download a windows 7 ISO and use the serial number.
Windows 8.1 Professional
🙂. That would also allow you install 8.1 later, and use the 8.1 license for upgrade purposes. I plan to
use 7 until they fix the GUI, but I wouldn't
buy 7, today.