The argument is that representatives need to spend time out of DC and in their home districts to keep grounded on what their citizens needs truly are...
I feel your pain as they truly just use it as an excuse to hobknob and hold endless fundraisers but you do not want these guys in session full time. 99% of the time, Congress crafts legislation restricting individual liberties and bankrupting the country. They only add to the bureaucracy, they never gut it.