I really like the idea, so i started a playthrough with it. Unfortunately, the save file size keeps increasing, it started around 50 MB and is now at just over 190, saving times are affected badly and i have a decereasing framerate in systems and especially hyperspace. By now, there are a bit over 300k lines that look like this:
Spoiler
<campaign.econ.lout__PlanetaryMoon_-MoonImmigrationModifier z="381156">
<market cl="Market" ref="175553"></market>
<id>lout_planetary_moon_e1dece</id>
<name>Planetary Moon</name>
<amount>-50.0</amount>
</campaign.econ.lout__PlanetaryMoon_-MoonImmigrationModifier>
The ids vary; just flying in a circle for 5 seconds added around 250kb to the file.
I'm not sure if the rate of bloating is constant, but it starts in a new game, and it also keeps going while paused and doing nothing, every time i saved a copy a few seconds later, it increased in size.
edit: it happens even if no other mod is loaded. File size seems to be increasing more slowly, possibly because vanilla generates a smaller sector than i'd like, resulting in less moons being generated as well.