Goofy as this is, it's actually LESS goofy than the bride and groom themselves signing a legal contract before the wedding.
Our culture is trying to replace relationships with binding obligations.
Marriage used to be a binding obligation. In the old days, it took an act of the state legislature to get a divorce. Then, divorces could be granted could be granted by a judge, but only for 'cause'. Convenient, on-demand divorces have only been around for a few decades.