On an extension? I would wager ... between "nothing" and "not much" On the service the extension ties to? Depends on how much you can reasonably charge for w

On an extension? I would wager ... between "nothing" and "not much" On the service the extension ties to? Depends on how much you can reasonably charge for what the service does - and if you are doing something that is already being done (for free/cheap), how are you different/better than the competition?