Yes the potential for economic growth with this game is unlimited. I don't think people realize once you have the building you can use it in any other missions you are given. Where before missions may have began to feel tedious or overwhelming, it adds new ways to navigate your way thru the main story campaign or the side missions. The more DLC I purchase the more complete the game feels and more balanced it feels on any difficulty level, for any campaign/mission.
I love to see so many people taking the time to complain about a game, but not give any actual feedback as to how it hindered their gameplay experience or how they could have improved. Not very helpful to the creators if you just say it sucked and whine about the $5 you had to spend on it.
Just a heads up to future bad reviewers, give them info on how they could have improved it, don't just complain about it. I have a feeling all this DLC is adding up to another large campaign mission that will be much easier to complete provided you have these additional buildings. Although on their own they seem useless, as I go along here, the more has certainly been the merrier.