For real though, I think most dudes go in looking for ways out...Maybe we do it ourselves subconciously.
It seems that the problem is the "one uppance" mentality. That being we think if we can find one great guy, we can do even better...not even considering that the great guy we got may have actually took a step down to "try" to be with you.
I think the Internet killed off the last true vestiges of intimacy and getting to know someone. We can order what we want like pizza, and it will come right to your door...no need to get to know someone genuine, when you jump straight to the transaction. Plus all of us seem to be closet narcissist, consumed with our schedules (work, working out, family - who by the way won't compromise their wives/husbands and kids for us) that we don't invest the time to get to know a good dude. We just want to add water and shake...
We say we want good looking, nice job, intelligent, funny and all that, but when we get it...we let the little stuff, the little flaws that we all have, just cancel out all the "big stuff"...we want to one up it. And how many of us never step outside our box? I didn't (I will now, lol).
It is hard work, and it seems (I am guilty) that many of us would rather work on our bodies, our homes and careers, harder than we are willing to work on getting to really know someone and turn it into a real (sans bullshit) relationship.