The first, and most obvious point to be made is that wedding photography is different than other types of photography. In the study, Consumer Reports queried several vendors with two different scenarios.
Here’s the example from the article: “Some photographers inflated their pricing when the affair was a wedding. For instance, photography for a Saturday night wedding in mid-October cost $300 per hour at [photographer's name removed]. For a 50th anniversary party of the same size at the same time with an almost identical package of services, though, the charge was $150 per hour.”