yes, there are.
lots of people who originally planned to have a wedding photographer end up asking a friend to take the pics. in most cases, the friend - who often doesn't have a fast enough lens to have decent lighting or a good enough camera to get undistorted photos, is very nervous about this because they know how much they don't know about photography and that in wedding pics, there are no do-overs.
a couple years ago, a relative got married. he asked another relative and my son to do the pics. the other relative turned out to have a cheap camera with a built on slow lens. the pics were dark, distorted and dismal. my son's pics were better, but he hadn't worked indoors at all previously with the lens he used, so they weren't great. my relative and his new wife were thrilled with these pics, which is typical of the people i know who instead of getting beautifully lit, perfectly framed wedding pics opted for a buddy with a camera.
another thing being done these days is that the bride and groom or their folks buys all the guests disposable cameras and tells them all to shoot the wedding. a couple of my friends did this, and the pics were universally poor and poorly lit. i guess the important thing is that the cost of the disposable cameras was far lower than an experienced wedding photographer with pro gear including a full frame camera and a spare, great lenses, experience and talent.