Which is why it's ridiculous for developers to worry about it, those 25% would never have bought the game in the first place, just pretend they don't exist. Do you know how much effort it takes to pirate an iPhone app? First you have to find out that pirated binaries even exist, then you have to jailbreak, then you have to fight through mountains of spam and scams until you find the right communities, then you have to spend time learning the technical tricks, then you have to hunt down the pirated app binaries. These people are determined not to pay, they aren't your customers.