Interesting idea to get some visibility for app developers. Although for the app purchaser I think you may get some reluctance as they first have to pay for the

Interesting idea to get some visibility for app developers. Although for the app purchaser I think you may get some reluctance as they first have to pay for the app (using an iTunes account) and then get the refund through a different mechanism (Paypal). This may be a bit of barrier to usage for certain users. My startup (self-promoting link-whoring: http://www.happybuy.com/ http://www.happybuy.com/) also helps to find price-reduced iOS Apps and tweets the biggest bargain product of the day. It's an easier mechanism for app purchasers to understand but obviously it doesn't address the value equation for the developer like TapZilla does.