In most cases, the wedding photographer can't be everywhere at once and is focused mainly on the bride & groom, so the wedding cameras are a wonderful way to see how much fun everyone had at the wedding.
At the end of the wedding reception, the bridesmaids will usually collect all the disposable wedding cameras together.
The bride's parents will develop all the pictures, and the family will re-live that special day over again from a candid perspective! Mailing the wedding camera photos to the guests that attended the wedding along with thank you cards is a very special memento that is highly appreciated.