I'm starting this discussion so people can share their experience on developing apps for customers.
Feel free to add a comment to let people what's the maximum amount you charged to one of your customers per one app development. It would be helpful to also know the country of your customer.
I believe that the highest I remember was 7500€ per one app developed with Mobincube to a customer in Spain. And 14.000€ per one app developed with Codoozer to a customer in Italy.
