Come on, man, you KNOW that's not true. The recommended CPU here would run between $250-300 at minimum plus a motherboard so you're likely looking at $350-400 (unless you find a killer CPU deal and settle for a dirt cheap motherboard which might drop you as low as $315-325 at absolute best). Then there's the GPU which, for a 560Ti, would only run you around $150-ish. So we can ballpark about $500 there.
Then you add in case, power supply, memory, and operating system. You can't buy ALL of that for $100. So the minimum would definitely run you more than $600 *AND* it would not provide a particularly good experience, I'd imagine, as you'd be seeing lots of unstable framerates in most modern games.
I mean, a 560ti even drops frames in stuff like Dirt 3, which is really not demanding at all. Most of the benchmarks indicate unstable framerates at 1920x1080 and even stuff like 1680x1050. For newer, more demanding games it's only going to get worse. Why would you drop $700 on a rig that won't be able to run games well at all a year from now? It's madness.