Brilliant comments throughout:

You can’t combat piracy. Externalities are a cost of doing business. Anyone who thinks otherwise is kidding him/herself. There’s exactly one way to maximize profit, and that is to deliver a product that people are willing to pay for at a price that they are willing to pay. The pirates were never your customers and never will be, and the sooner the companies accept that and focus on the real problems (massively overpricing everything when first released, delivering products that can’t easily be moved between devices because of the restrictive/broken DRM, and the declining quality of entertainment products in general), they’ll have better profits.

Source: Reddit, Google, Amazon, Facebook and Twitter consider blacking out their sites in protest of SOPA