So this is just a theory. But, maybe like heat, but blue, there can be slight mist drops. I'm not saying frequent enough to play forever cause I understand and support spiralknights needing money to keep this awesome game long, but rare enough where it might, of lucky get one maaaaybe two more elevators.
Along this note, I think like rare armor drops they can have rarer lucky crown drops. Where more then normal will come from a random enemy but very very rare.
I think they should just change the total mist to 120 so that you can run t1 and get to basil in t2 every day