Arcades should help members prioritize their path into a community. It should help them make decisions about where they want to go and what they want to do. If users know what information is important to them, they can make this decision better. The community arcade should give a view into the community from the outside without overwhelming users.
In any civilization, an age can be measured by whether or not the best and brightest are applying their talent and wealth to make that civilization work better, to inculcate patriotism, to build and improve institutions, and improve the lives of their fellow citizens.