The people who made the beautiful adventure game Machinarium estimate that only about 5-15% of the people who played their game actually paid for it. They don't seem too pissed. In fact, they're offering those thieves a sweet deal.
Amanita Design is now selling Machinarium for the paltry sum of $5 USD to anyone and everyone who'd like to pay for things that people spend time and money developing. That includes the game's soundtrack and a chance to right one's wrongs. A bargain compared to the original price of $20 USD that most people opted not to pay. (The deal is actually available to anyone. No pre-stealing required!)
The Machinarium folks are also throwing in a song, "Pirate Amnesty," to commemorate the occasion, free of charge. You can grab Machinarium on the cheap for Windows PCs, Mac or Linux right now if you want.