You just push a few buttons and you are marketing. With that done, the rest is just a few minutes checking email, and helping any of my customers that need me. You are not tied to your computer all day. It will take about a day to set it all up. You don't have to spend your time finding the latest software or lists, they come right to you.
Most people are so pleased they stay on month after month.
Now, we both know some people will sign up for every program on the market, and even with the best of intentions, don't put any effort into it. Then they drop out and don't want to pay for the program. And most people are so pleased they stay on month after month. Your customers will have the same option, and you will find most will decide to stay. Just keep marketing and adding to your customer base.