I'd have to disagree with the overpaid motivational speaker bit. In that instance, you're paying for the name of the artist, kinda like the washed-up athlete. I think people will still buy a Testaverde jersey on game day, simply because he's Vinny Testaverde (or Doug Flutie, or Emmitt Smith, or Jerry Rice, or Bill Romanowski as the case may be).
One way around the overpaid wedding photog is to put disposable cameras on the guest's tables and let them take their own pictures, then hire a moderate photog for the posed shots before, during, and after the ceremony.