[dumbluck]

Well, it would definately make the Planet Conditions more important, especially in the early game (better conditions = quicker reproduction). But it would also slow down early game expansion a _LOT_! You probably couldn't afford to build anything on that first colony until it was about half full of ppl; or, you could start building on the second colony right away, but you wouldn't be able to afford the maintenance on any ships until you _stopped_ building on it!