I've just come to the forum and found this thread, I came here because I've noticed that whoever was sharing in Florida seems to have stopped, not seen a single flight anywhere over Florida for 2 days now, clearly users are dropping off the network.
I subscribe to Live Flight Tracker which IMHO offers far better value for money, on live flight tracker North America is lit up like a Christmas tree, on radar box network there's only a few clusters near major cities.
I understand there is a cost for running the service, but it is the users that supply the data, if the users don't supply the data anymore there will be no network, no one will pay and Radar Box loses the main advantage it has over the competition.
Personally I think the price is too high, data is provided by the goodwill of the users, using their electricity and bandwidth, its not just Airnav paying bills to keep the network up. Due to the current lack of traffic on the network I wouldn't pay for it, I would just use live flight tracker instead.