Now 4715, it is easy to to want a prenup when you are young or don't have much.
Now, if you had children from a first marriage and you had lot's of money while your mate has very little, wouldn't you want to protect all your hard work?
Maybe if I were the rich one I would want to do the same. I don't know; I see his side. That's why couples with similar level imcomes are a better match.