You'd pay twice this much for one cable in-store
If you're assembling a home theater system, chances are cables are an afterthought, which means a big box electronics retailer can charge exorbitant amounts on them compared to what they're actually worth in order to drive up their profit margin. But if you plan ahead and go online for your cables, you can get a much better deal. 6 HDMI cables for $12.99
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Marketing hype aside, these are fundamentally just bundles of wires, and so long as they're within a reasonable tolerance, there is no difference in picture quality between a $2 HDMI cable and a $30 one.