How complex can you get?

I found a game called First Age Avalon which is by far the most complex and intricate text based games I have ever come across.  There is even a economics system in the game which is huge.  The game it’s self is a text based MMORPG which explains the economics system.  This reminds me of the intuitive nature of the parchment game that we did in class on a much grander scale.