Space Cities- worth while?

[Arak Koba]

I only have the Gold demo, but I noticed that in the beginning of the game, the homeworld(s) have maxxed out population. So what I did was build some space stations with cargo pods to hold some of the population, thus allowing the planets to max-out again.

Is it really worth the effort and resources to build these 'habitats'? (I had enormous amounts of excess organics btw)

The only serious disadvantage is the temporary hit in bonus production because of the 4000M population being less.