If you go to a web site that does A/B testing, you're going to get a set of instructions about how to install it on your site, and then it's up to you to figure out what changes you should try. You now how more work to do, and no better idea about what you should be trying.
If you really do have a way to replace a full-time marketing person with an automated web site, build it. It will be a gold mine.