Interesting thoughts, Sher.

Some men prove to be "terrible husbands"--for certain types of women.  Wive #2 is thrilled.  It's a mismatch, and men often would complain that their wives are "terrible," too, and the next guy thinks, "he let her go?  Is he insane?"  

I also think it's a matter of priorities. How IMPORTANT is the marriage?  Big enough priority to work through the difficulties or the "mismatched" expectations?  For some men, I think, the answer is, "not THAT important."  So they don't.  That's likely when some women file. He didn't meet her "half-way."

I also believe there are too many variables, too many dynamics for any of us to even approach definitive statements on this.