I honestly can't say. There are quite a few studies that suggest prenups make divorce more likely, but probably those more likely to get divorced are more likely to get prenups.

I would turn your question around. How much does your potential loss from an event affect how hard you try to prevent it from happening? My guess would be the greater your loss, the harder you'll try.

When in the midst of what feels like an irretrievable situation, knowing that you stand to lose economically can make you go back and work on it - and that's usually a good thing. That's my personal experience, but I'm sure it's not true of all people in all relationships at all times.