I pay for software and I bet everyone reading this, has as well. The question is which software, doing what, and how to get paid. To take iPhone apps as a cate

I pay for software and I bet everyone reading this, has as well. The question is which software, doing what, and how to get paid. To take iPhone apps as a category, some are paid, but most are "free", because experience shows that people will easily try a "free" app, greatly preferentially even if the price is $0.99. But for many, probably most, of such apps, there's in-app purchases, designed to be an ongoing source of revenue.