You are not hiring me to perform a common wedding ceremony for you; you are hiring me to perform my wedding ceremony for you. As evidenced by this website, there is a considerable difference. I honestly do not need or want input from third parties- just like your florist of photographer doesn't want advice from third parties either.

I will gently lead you, like a theater director, through all the beautiful options you have chosen for your wedding
  ceremony. I am assisting your photographers and cueing your musicians or DJ as well. 

I govern all. This is not to control freak you. It's to get results. You have spent thousands on this. Your reputations and those of your families are on the line as well. And if you are the typical bride or groom you will have from 20 to 400 eyeballs on you for 30 minutes straight.

You are hiring me for results. I'm going to deliver those results - in spades. It's just that from time to time a wedding coordinator, a future mother in law or even a bridesmaid will take it on themselves to advise me on how to perform a wedding ceremony. They invariably become offended should I disagree, not to mention the time that is lost during a rehearsal. Some ministers really don't care if the ceremony they perform is designed by someone else. I'm not one of them.