The Creation of Security
Such settlements, while useful for the rich and famous, can provide anyone who wishes to protect their assets or a particular asset with an agreement that does this.
It may even be tailored to ensure that things as minute as pet ownership are properly identified, avoiding an acrimonious dispute over same should the relationship break down. Some relationships do break down, in which case dissolution needs to be achieved as painlessly and cheaply as possible. A well drafted pre-nuptial agreement can help a lot.
Clarity of Purpose
The aim is always to create a sense of simplicity and predictability that will prevail should the parties choose to go their separate ways at some unknown future date. Since couples may be together for many years before a pre-nuptial agreement is revisited, the drafting has to provide as much clarity around potentially contentious issues as is humanly possible.