Are you aware that passive income being introduced at all is kind of a revolution? Also: Colonizing a system costs 25 million up front, but you actually get paid and make a profit (even if it's small) delivering the goods and eventually at least get your 25 million back - so much for putting money in it.
So for example, I built a single outpost. so far I "invested" 25 million into the system - a one time investment - and can build as much as the system can hold for no additional charge. Then I delivered the mats, and came out on top with like 25 million or so.
Now I got a reward of 100k for this week. Assuming this stays the same, this outpost alone nets me 5.2 million a year. Additional stations will add to that. Show me any property investment that turns a profit right after it is completed.