An example:
You have posted the link on your website. There have been 500 clicks a month, and 35 of the clickers have become our clients. Let’s say, each of them would buy services for $110. In this case your profit will be $577.5 that month, and 15% of all the following orders of these clients. Considering that one in three repeats purchase once in two months, you will get about $8500 a year from the customers you brought during the very FIRST month.