Originally Posted by Dhruin 
Personally, I'd prefer every cent went into expanding the game. Just my opinion.
The few games I've played with official, supported mod tools were expanded beyond the wildest dreams of the developers.
Setting aside the Bethesda games, I recently had a chance to use the Grimrock dungeon editor and I'm confident that over time it will result in tens of thousands of additional hours of new content available for that game.