After all,the investment in terms of time,intimacy and emotions have a strong value too in such relationships.
Financial investment is secondary.
A man willnt see how much money has he spent on his wife till date if he finds out she was cheating on him,but will rather feel the loss in terms of the time and emotions.
And since the feminist laws are such that you cannot divorce your wife without paying alimony,the stigma attached to it,fear of losing custody of kids,etc-men try to be in their marriages and end up suffering or giving up.
I don't say that women are fine and enjoying-just that women already have a lot of speakers and laws for them.
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