Gaming isn't expensive, not even when you're a PC gamer who wants to play Skyrim at the highest settings possible. Thanks to the reduced cost of just about every piece of hardware and the standard requirements of most games remaining relatively sane, it's not too difficult to have a powerful gaming rig.
That said, the upper ceiling is pretty damn high, and Youtube user maxishine has set up a $30,000 gaming room with top of the line hardware.
It's the complete opposite of these horrid gaming set ups.