Are the different income sources meant to be very imbalanced?
Like, steet whores and drug dealers have pretty equal income and take some time to get started (raise work ethic).
But drug couriers seem much simpler and better; 1k profit per run and no startup cost, can buy a girl for 500 and send her away. For comparison, a fresh girl working steets or dealing will make low double digit profits at first.
Then the farm: It takes me multiple days of exhaustion to train a slave for 3k, when every day that I mess up and get too exhausted from flogging and don't push drugs at the night club is a lost opportunity cost of 2k.
At the extreme end, a shop costs 10k to open up. That's 20 drug couriers.