#1 Posted by Po-Rayu -
"Bite the Bullet" (2010) - http://www.youtube.com/watch?v=mKVEcnE17Zg
#2 Posted by Marikhen -
As for the rest, it varies. Per moon, per planet of a given type, per population, etc. You might have 5 dust upkeep on something that adds +2 food/population in a system or costs 3 dust and yields +2 dust per (explored) moon in the system. In the latter case if you don't have enough moons to warrant implementing that improvement then you clearly shouldn't use it, but in the former case there's really no reason not to go for it unless the system you use it in has a really low population cap of something like three or four.
I could probably explain better if you could cite specific examples, though given the time since you made this post I'm not sure you'd read this much less still need the information. :-)
Stop complaining. I could have done this more painfully. - Dryad from Sacred 2.