Because my GTX470 SLI setup was cheaper than a single GTX580 while giving considerably better performance and when overclocked is not far behind an overclocked GTX580 SLI setup that costs considerably more. With the 570 not really changing that with the current prices then unless the latest and greatest AMD GPUs are considerably faster than the top nVidia cards or considerably cheaper I'll be even happier at the value for money I'm getting from my setup instead of it quickly being rendered obsolete by new cards. I assumed that was fairly elementary.
One problem.
You don't buy ATI cards anyway so there value & performance is pretty much irrelevant seeing as you would not have it regardless & the possible interest in feeing good is that your not losing on value & performance by not buying ATI.
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