Since the cost of the app is so low, along with the barrier of entry to buy it, this data suggests to me these people must be discovering it through the piracy community (peer recommendation basically) If they've already learned how to pirate iPhone apps it's probably just easier for them to use a process they're familiar with. I'm guessing the ability to do batch installs of many apps at once is a big selling point of the iPhone piracy community so maybe Apple can learn something from that.