Another point, I think no matter which model you pick the best way to manage it is to have it in from the start and stick to it. People may have no problem pay

Another point, I think no matter which model you pick the best way to manage it is to have it in from the start and stick to it. People may have no problem paying $10 a month for a service, but when that same service was previously free or at least free at there usage level there is going to be a backlash and if you are in an ultra competitive area like this one that could be a big problem.