I would sign up, if that's any consolation :) More generally, it's one of those things that you don't want to change if it works well. Maybe the best model is

I would sign up, if that's any consolation :) More generally, it's one of those things that you don't want to change if it works well. Maybe the best model is an short term contract (e.g. 3 or 6 months) which can roll into a multiyear contract.