Nowadays, almost everyone uses banking services. However, there is room in the market for bad decision-making by clients in the RCBS market, which is caused by information asymmetries. The main goal of this paper is to simulate consumer behavior and compare the offer in the banking services market in the Czech Republic. A total of 9 different payment accounts were selected for the research, which are intended for non-business natural persons. Furthermore, two customer groups were defined, for which the fees for the mentioned payment accounts were subsequently calculated on the basis the intensities of the use of certain services. In general, it was found that the stochastic calculation is more different than the deterministic one, especially for accounts and services that contain a certain condition, and the intensity of use is close to the transitional limit of this condition. On the contrary, in the case of bank calculators, the differences compared to the calculation from the tariffs were too large, and there was also a considerable mixing of the order according to the price.