The main problem that I see in implementing what you are asking is related to the bandwith cost. I still haven't figure out how to measure how much bandwith a

The main problem that I see in implementing what you are asking is related to the bandwith cost. I still haven't figure out how to measure how much bandwith a trivial application is using, so my price is only based on time. If I let you using the service for as long as you like you either need to pay A LOT or I don't allow you to use the network connection...