[Sombre]

The problem with that, Edratman2, is that Ctisian players still wouldn't build in swamps. A high admin expensive fort in a swamp still offers no synergy, even if it's faster to build. Hence you'd either have the players building elsewhere, or if that was punished heavily, you'd just be dumping all over Ctis.

Time cost is clearly the biggest issue, but the gold difference between an 800 fort and a 1200 isn't a trivial matter, particularly in the early game. The 1200, even if it took the same number of turns to build, is fairly unlikely to recoup the cost effectively.