good idea , raising the minutes is always good.
i like the minimum charge idea too.seems to have some potential there.
instead of a trip charge, maybe something like a "basicrate" or "starting rate" for which will be service performed as usually, same for the rates,as usually
instead of overcoming a tripcharge during the prequalifying i kinda get a "preapproval".conversion here i come
sure needs some fine tuning but i like the idea