What would be better than having the ability to buy land and a Castle?
I'd love it. You buy a Castle and have Henchman based on your Level, Favor and Reputation (Based on Server).
I remember that from NWN2 and that was one of my favorite parts of the whole game.
Building up the castle defenses and increasing henchman.
You would need to use your gold for upkeep and improvements. Possibly DDO Store Points too!
They could design quests just for the concept of building your castle and it's defenses.
I think it would bring another aspect to the game. A Castle for all your toons(depending on Server).
So you'd have D&D and SIM all in one!