Are magma cube minions terrible now?

I just made a setup of 25 t12 magma cube minion with lava buckets, super compactors, and minion expanders. I put a postcard down and all I need now is better mithril infusions (not doing that), fuel and a t5 beacon which I'm currently forging. I left them for two days and they made less than 70k each. Am I missing something or did prices tank for some reason?