This is not the whole story though; as people still have to collect/buy the AM cores. So technichally they’re still doing something for it. As well as at some point having to gather the credits to get the maximum lvl, anything less than lvl 10 in the OAM ore list is not really worth paying a core for.
I agree with this though. Say go from 10 to 30 levels. LVL 30 being double whatever the gather rate is now. But at the cost of 1 core per day. LVL 1-10 1 core per 3 days. LVL 11-20 1 core per 2 days. LVL 21-30 1 core per day.