ROI is still super high, it's just players expectation about gameplay, they prefer to not think and earn. If people complain they earn nothing and they don't have law firm. Similar with military stuff. It's not easy game, especially on tax edge, where players that were prepared earn more than players that just bought and left it.
So it is more rewarding for players who actually read rules and played.
Same below bhoa could earn much more in last few months with Law Firm.

Now imagine how many players are there that just bought items, did nothing, have no law firm, no military stuff cause sold it when it was expensive, and will blame game cause it's rewarding players who played better.
Game always distribute 300-2000$ daily depends from taxes, it's never 0.