Federico Viticci:

It may be called “gaming the system” or “forecasting downloads” — in both cases, I don’t think that “showcasing” apps by finding loopholes in the Developer Guidelines and leveraging advertising techniques as tools to manipulate Apple’s ranking algorithm is good for the App Store. I believe this is true for AppGratis and any other native iOS app that is based on this premise. It’s in Apple’s right — and developer agreement — to ban apps that work in this way.

Good story from Federico — worth a read.