The new changes for supply-producing LE (limited edition, event-won) buildings are actually rather useless for chapter 6-8 players.
Whatever am I going to need 177 dust per day for? My elixir manufactories produce 15K to 30K per day. Even if I don't manage to trade it all off every day, I can usually get 2-3K dust in a single trade. Upgrading a single house takes around 1,000 T3 resources.
More importantly though, in these levels I don't even NEED the dust that much. T1 and T2 goods are much more needed on a daily basis, especially before Fairies.
So, to sum up, while the Supplies production wasn't anything very useful, at least it had some marginal use. The Mana Fountain made 2000 supplies per day. Now it makes 177 dust per day. That's a definite and painful nerf -- the building is going to the scrap heap now, unfortunately.
You can see the difference between 2000 of something and 177 of something, rig