Content providers are often considered as free riders by network operators, which levy charges for the use of their network to recover their costs. But such charges may seriously reduce the profitability of the content providers’ business, which relies largely on their advertising income. As we have shown in our paper "How Much Can Content Providers Afford to Pay for Network Charges ?" (presented at the Sixth UKSim/AMSS European Symposium on Computer Modeling and Simulation, EMS 2012), this may not be in the general interest if customers are also charged on a volume basis. Here you can find our presentation at the conference.