Professional approach to the work in any sector of the economy involves getting benefits from it. Development of programs is not an exception. Therefore, the economic efficiency of the project is a main goal which needs to be put for developers. It can be simply defined as an attitude of sum of the desired income towards the sum of the cost. If a project (for example, a computer game) is oriented on the massive usage it will be very difficult to count any profit in advance. One of the methods of estimation of profits is an analysis of projects-competitors. But it is difficult to obtain an accurate information on the number of sold copies of the product. That is why any data on the level of income may be wrong because "other people's money is easier to count than yours."