2 observations:
If you level your researches, the cauldron is pretty useful for end-chapter players with minimal investment. If you’re at the end of chapter 20 and have a level 30 bee trader, just using one 100% coin rain with the wholesaler for goods covers levelling up all your 20 diplomas to level 50-60 research. Recurring witch points could guarantee end-game players 4-5 goblets of something each week. It’s easy to see how INNO might see the benefits of the cauldron as a no-brainer just for spending one coin rain.
However, INNO is needlessly setting players up for frustration because 1.we cannot store potions for later use and 2.military and production times pit the two bonuses against each other. For example, if before morning pick-up I try for a resource potion and get a military potion, the military potion will expire before I can use it in the evening. If I’m aiming for a military potion for my timewarp at afternoon brewing and pick up a 13 hour production goods bonus instead, the long production bonus is actually frustrating because I can’t make full use of it! Or I pick up two redundant military potions, where again, a potion is useless. Why force players to waste potions every week unless you want to frustrate them?