I love Wife Swap! I was originally VERY opposed to the concept however, it looks like they try to place the wife with a family that is very opposite to hers so that she and the other family can see what the other half lives like. Based on the discussions that the couples have afterwards, the experience helps each family find balance and not live so extreme to one philosophy or lifestyle.
This show DOES prove that there is more than one way to have a successful marriage. One formula CANNOT work for every couple because each situation is unique based on the background and character of the individuals involved as well as the financial, social and cultural environment in which the couple resides.