"... There's no way to pay Google for more cpu/bandwidth/storage. ..." Agreed, this will change in time. But I'd use this point to refine the idea as you sugge

"... There's no way to pay Google for more cpu/bandwidth/storage. ..." Agreed, this will change in time. But I'd use this point to refine the idea as you suggest on cheap hosting. "... The system is also very propriety and there is no (easy) way move an appengine app to a new server. ..." Not convinced of that. The biggest problem is not the porting of an idea but replicating the scaling.