Apparently, according to Google Analytics, the most commonly "googled" wedding question is this: How Much Does a Wedding Minister/Wedding Officiant Cost?
As a wedding celebrant, I spent a lot of time helping people with their ceremony. Though most ceremonies last only 30 minutes or less, there's more back scenes preparation that can happen than you might imagine. And most of that time is time well spent. Central to your wedding day experience is the wedding ceremony itself. If that doesn't go well, then both the couple and guests feel let down. How many times have you ever been to a ceremony where you sense the pastor doesn't know a couple? That never happens when I officiate a wedding.
Also, there's a big difference between "price" and "cost." If the ceremony gets messed up, then the "cost" will be much greater than whatever "price" you paid the officiant. I did a wedding recently where the DJ was a friend of the groom. On the wedding day, the DJ was a no-show. Can you imagine how the couple was scrambling to provide wedding and dance music at the last moment?
Sometimes it's best to pay a first-class professional, someone with whom you have a contract, and you can hold them to it. As in everything, if something is good, it's not cheap, and if something is cheap, it's not very good.