My understanding is that on a normal Congressional salary, it is extremely difficult to live in DC while maintaining a home in your own state. I would also imagine the time needed to conduct a campaign can't be done by a normal person like you or I while trying to feed your family. So, under the current system, it is skewed towards those who can afford to campaign for office, raise money, run for office and maintain two homes while serving in office. Its unfortunate, but a fact of life.