You can't find anything in the real world even close to being comparable with alimony. The whole alimony concept is outdated and needs an overhaul. Women wanted equal rights and now they have them. They have the right to work for a living just like a man. In fact if a man and woman apply for the same job, if both their qualifications are equal, the job goes to the woman. So now the man who owes alimony can't pay it and goes to jail.
You are, of course, ignoring the fact that rights ARE equal under alimony laws.
If I meet a rich doctor who wants me to stay home with the kids while she works, I'm just as eligible for alimony as she would be if the situation were reversed. It has absolutely nothing to do with gender.
Or what about the case where a woman works 2 jobs to put her husband through med school and the day after graduation, he divorces her. She didn't make a contribution worthy of compensation?
The principle is simply a recognition that contribution to a marriage is not limited to the paycheck that a person receives. And the fact is that the majority of lawmakers accept it in some sense (at least as recognized the number of states which allow alimony. Note that in most states is it has to be demonstrated that the receiving spouse is entitled to it - it's not automatic.
If you don't like it, write to your legislators. Or, there are a lot of countries in the Middle East that don't have alimony where you could easily move to.