If a room is full of service people who are they serving?

It's a classic dilemma when you get a bunch of service minded individuals together, which I noticed again on a Wed night. After an hr of meditation and an hr of discussion we eat dinner. Immediately when the dinner transition occurs there is a rush to the kitchen to help, a rush to set up the dining area, and then after dinner there is a rush to do the dishes. There is some fun and playfulness in the jostling back and forth for the opportunity to do the dishes, but this time as I watched the scene play out it made me think about this dilemma. When everyone wants to help/serve then who is there left to serve? In the office when there is a cake and they start passing around the slices on plates inevitably the plates make a full circle. In the cake scenario no one wants to be the one to "stop" the flow. Don't get me wrong I think service and selflessness is important, but it is just as important to be the recipient of the acts. With Karma Kitchen one of the things that is stressed in the very beginning is that before serving all volunteers should be guests to experience the true essence of the restaurant. I also think that the real meaning and intent of some of these acts gets lost in the jockeying for a role. It also makes me wonder about the person who isn't forward and aggressive about helping. Should they be denied an opportunity to serve if they aren't able to hold their own against someone like myself?