Business coaches tell us that if you want to increase your bottom line, one thing you need to know is just how much income you receive from the average customer interaction. This is the transactional value of a customer.
If you want to improve your numbers, you need to establish a baseline. This single transaction average per customer is your baseline. Then as you begin to add various upsell services, you can watch that average increase.
By the time one year has elapsed you will be able to see a nice uptick in income based solely on the fact that you have improved your average transactional value per customer.