If prices of anything were ever determined by the price of a terabyte of data, you'd be right. However, in this case, they are not. The price of data is wholly

If prices of anything were ever determined by the price of a terabyte of data, you'd be right. However, in this case, they are not. The price of data is wholly irrelevant to this discussion. As an app developer, I can tell you that visibility is not zero. If you understand how the store works, there is still excellent money to be made there. The 30% cut isn't outrageous. You just can't be pushing shovelware.