"because we can" seems like a pretty good answer. Also, a thing that's interesting to me about campaigns like this one is there are so many iphone users. Even if a small fraction of them actually want to jailbreak their phones - for carrier reasons, to install some goofy skin, whatever - there's a lot of value in getting it done. How much value? I'm not sure - but I don't think $50,000 or even $100,000 would be surprising...