True, though I'd somewhat wrapped them more under "won't benefit", since the economic benefits would be outweighed by the emotional costs. At the same time and to state the obvious, people are aware of and overestimate the chances of future emotional states being positive.

And, obviously, neither partner need be or become "bitch" for a relationship to result in an overall positive experience, or less-positive-than-readily-possible experience, and humans do not seem to have good established tools for estimating future emotional states on this long of a timeframe.