why women marry when the know that their wanna be husband already has a wife. It has got to do with the culture. If you talk about afghanistan the problem is that the percentage of women is much higher than men. and good guys are very hard to find in afghanistan. and it is considered the norm there if a man has 2-3-4 wives

if you talk about united states, there are some communities that practice polygamy and they are brought up thinking that polygamy is the right choice.

In newyork good guys (like me :P) are very hard to find due to the higher percentage of women. ane many girls are very eager to leave their family homes and live independently. and they cannot do it all by themselves. they need a man to contribute financially