What Should My Average Conversion Rate Be?

People come to me all the time and say, you know, what should my average conversion rate be? It's like, all i don't with care what your conversion rate is. I care about how much you are paying to acquire that action,. Whether it be a lead or a sale, and how much that is worth to you. And then the conversion rate at that point becomes relative. There's some companies that are selling the exact same type of products that are getting by with one and a half % conversion rate, while others need five percent.