Quote Originally Posted by BDC
Probably saves them having to bother so much.

"Hey, we're really not going to get this ai up to scratch... I know, some guy will do it for free for us if we just give him the tools! Score!"
On the other hand, leader of Civ4 project is Soren Jonhson, a "master genius" for Civ3 AI, which while surely not better then human, or in some case lacking (artillery), is miles away compared to earlier civilization games.