Why should I hire a professional when my uncle can tape it for free?
Consumer (and even low-end inexpensive “pro”) videos fail due to poor audio, inadequate planning and coordination to blend with the flow of the event, use of only one camera, shaky images, and insufficient battery capacity. Like photography, simple videos done by the guests are a nice adjunct to, but no substitute for, the professional video. There is no substitute for a professional who comes prepared with the right knowledge and equipment, respects the rules of your ceremony, and is focused on creating your video and is not there to “party.