I'm currently using tier 4. Before I upgraded, I was getting 2.56 mill for each hit. After I upgraded one dorm mate from level 2 to three, (intelligence) I only got 1.9 mill per hit. Can you explain this?
As you upgrade you will need more to suffice max plunder (kcs x 15m). Try getting max plunder again. It's also because if you upgrade a tier 4 past level 2 plunder will decrease slightly. This added along with smaller money in tutors will cause a massive drop for you.