Prenups (and postnups) often signal the end
In the article referenced above, Mr. McCourt mentions that each insistence by his wife on a post nuptial agreement reinforced his feelings that things were not right. So prenups and postnups may not be for everyone. But ultimately, if one party thinks such an agreement is so important that they would not be married without it, then the other has a choice. Apparently, Mr. McCourt made his.