The technology is the biggest reason I think. The foundation for the experience they want to provide is only just now getting to the point where they can shift focus to implementing the contet at a decent pace. There are ships that have been redesigned and reimplemented two or three times as that technology changed with the scope of the game.

Expansions to the $10m foundation would have to have been total technology and content rewrites to achieve what they are aiming for with the end release.