Great concept, I ran 3 emailer campaigns. Over these 3 campaigns I figured at what price people buy more and I can still keep a decent profit margins.
The Smart Wallets
Love the app's concept. I am running this as test across 2 products. It's really good to understand how people behave differently for different pricing. To get a good conclusion you would need to wait for a while and get decent traffic analyse at which price you get the best overall profit.