@ Baqar79: I hear you. Named bounties are only worth it if you can crush them. As for bar missions, I would like to see one as rewarding as yours. Most of them are under 100k, and I usually reject them. (Most of those that I accept are whose destination are at my colony where I need to go anyway to dump loot.) I get a few that exceed that, and only got one that was close to 200k. Maybe it has to do with fleet capacity?
Quantities offered are usually based on the cargo space you had when you first check the mission details out, but as for these big payout missions, I'm not sure. In any case I think the other time I got a big paying mission like that was also from my own colony. I do want to have a look into this myself however, see if I can figure out how to get them more frequently.
How do you get 400k? So far, I just got four size 6 colonies and enough stability to make free port worthwhile. They are making an average of 200k each (some more, some less). I am trying to race to size 7 for that fourth industry, although two of them need military bases for extra stability and big fleets to repel expeditions.
I make a lot of use of AI cores at my colonies and the colony in question is size 7 (more taxes to collect from Population & Infrastructure). Biggest credit booster is Free Port if you can cope with the stability drop. My colony went from 330k to 488k with Free Port turned on:
And it's mostly because Free Port allows you to export drugs and harvested organs from your "Population & Infrastructure" building which adds 110k:
This is a 3 industry colony (Mining, Orbital Works and Fuel production)
If however you grow your colony large enough even a 2 industry colony can break 500k (Mining & Orbital works - older game):
The Population & Infrastructure building is the most profitable here:
115.5k Monthly Income
75k Harvested Organs
67k Recreational Drugs
257.5k Total - Just from the Population & Infrastructure building alone.