[quote:PvK]
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I think there should be a bigger difference between spaceport Versions and normal ones
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I don't see why. Spaceport Versions represent planning and co-location, not more developed urban facilities. The big advantage is they save you two slots on the planet, which can then be used for other things which can be helped by the urban facility's modifiers, etc. It requires longer to build them, though, and so there are planning and efficiency considerations, depending on what you build on the planet and in what order. But since you can have either one Spaceport City facility, or a Spaceport facility and a Resupply facility and a City facility, for essentially the same time and cost, and they represent the same things, only arranged differently, I don't see how it would make sense to give the Spaceport Cities much advantage in performance over a city. I just gave them a +1 or so to add a little detail/interest, to represent the slight effect of convenient colocation, desirability, attention, whatever.
PvK
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Well, just take a look at the basic history and how ports affected economy, wars, trade, science, development, basically everything. A colony with a spaceport has the opportunity to become a major interstellar hub for traffic going trough the region.
Other than that, the offered services as well. In my modified Version (i alway modify everything i get my hands on, thats where all the stupid ideas come from

), minor spaceports only give spaceports, while everything above spaceport city (excluding city and major city) gives a resupply depo as well (they also have an increasing repair capacity). This is supposed to simulate the ability to deal with the supply / maintenance of passing ships.
of course, their price is significantly higher than the price of the normal facility.