Clan Citadels aren't effective a year later. It is possible to grind them for a better building. The building isn't much use and RS gold doesn't do much. You get xp for doing it. This is fine however it's not the primary point. The following features seem to be pointless to me, at least according to my knowledge.
The Keep is also home to the Parliament room, as well as majority of the vast spaces used in the citadel. It is difficult to hear the speaker if you are sitting at the edge of. The crowd can be distracting, and it's easy to forget you are meeting elsewhere. Is it really necessary that clan members meet in the game? What's the OSRS buy gold point of being in that most coveted space?