OK, I go to work, so I can pay my rent, food, water, electricity and other stuff. Eight to ten hours of my day are work.
I get home, think for myself "Well, lets make some money in Elite: Dangerous". I pick up passengers, heading for one station, distant from the entry star. I fly there for about an hour (depending on the destination), get interdicted along the way, so I can't do ... my laundry. I let the passengers disembark and get rewarded with a high amount of money. What do I do with the money? I invest into into ships.
Instead of removing the payouts, you could tie the missionboards to a player. I get the same missionboard in every mode.
edit_01:
You (FDev) have made this mistake before. Do you remember when the first AX missles got nerfed? You said, that the Thargoids have adapted. With nerfing the weapon, you reduced their effect on HUMAN ships as well.