The infringement isn't driving down the value. Market saturation and lack of scarcity are driving down the value. Copyright is an artificial construction, an attempt to create scarcity where there is none.
Copyright infringement is, in most cases, the result of asking too much money for a product that has very little intrinsic value and the addition of customer-unfriendly measures to legal alternatives (read: DRM and all its woes).
Copyright infringement is, in most cases, the result of asking too much money for a product that has very little intrinsic value and the addition of customer-unfriendly measures to legal alternatives (read: DRM and all its woes).