You expect me to do simple math in my head? If I am with friends it is usually more of a fight for the bill than a fight to split the bill. It is exactly the

You expect me to do simple math in my head? If I am with friends it is usually more of a fight for the bill than a fight to split the bill. It is exactly the case of people making apps that are worthless, and expecting the large user base to somehow adopt them. There IS a huge problem with monetizing various apps though.