People get prenuptual agreements to protect their assets in the event of divorce, right? When a person comissions a prenup agreement they are saying to themselves that there is a possibility that the marriage will end up in divorce. There is a modicum of distrust of a future spouse in obtaining a prenup. A person is saying that they don't completely trust the person that they are marrying. Personally, I don't think it is that hard to find a spouse with which to have a life long marriage, therefore I see no need for prenup. However, I realize that some just don't want to go through the trouble and they should get a prenup.
I've had two friends get divorced over the last five years. Both had prenups. Both prenups were found to be invalid and tossed.