People that have everything..?

I have a friend that is getting married, big over the top wedding, while at the same time building a mansion. Her and her husband to be have matching mercedes truck and bmw cars. She has confided in me once that she doesnt want to marry him. My question is when people have everything...what happens when they are done planning the "dream life" and everything is set and your living it....are you happy?? How do the people who have everything find happiness