Guy who made supermeat had a blog post on Piracy, need to find it.
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Anywho piracy is a fun topic not!
Piracy is something you should not worry about, no way to work out the income lost on something which is not real. So why put in measures like DRM which end up hurting the people who buy. The answer is making it easier for people to buy and own your product. To that you need to look at business model, games need to become cheaper.
No point in chasing after pirates, always going to be a hardcore group who pirate. Most people if you made games cheaper would not pirate or made it easier. Focus on the people who pay the bills!
Only case which piracy is fine is when the game is not released in your area.