I think the big problem with this event, it's not even the 25mil goal after all this event took 5 days, it's the potion rewards the big problem here, I'm still not sure if its worth waste any stam for a level 400 AL or a EF 250 even If we get 10 of then there is plenty of other better options (Darksun global), and I am guessing only 40% of the community is participating for the legendary recipes (being generous), since most guilds have those equips already.
Maybe next time add a AM 500 or even a Librarian/Conserve 400 to the Ogre blood potion, a Iron fist level 400 or any other offensive buff to the Zorgrom ale, maybe a teleport to the shadow vial, all I know is that these potions as it its aren't that much of an incentive, since not everyone is keeping drops for inventing