I've calculated how much making a Rarity Excluder will cost the player now. The result is... At least 400 PC total. The Voxels alone are worth 240 PC (15 PC each), but then there's other ingredients, too. I have never seen a rare decor item selling for more than 200PC, some of them don't even reach the "Top Item Auction Bids" list.

So, essentially, I imagine brewing a new Rarity Excluder scenario would go like this:
- planting 2-8 pumpkin seeds of the same color, the highest grade you can manage
- waiting 2 weeks with an already full-grown Voxel Plant
- finally giving your pet a potion only for it to return with something like a sewing machine you could've easily bought for 25 PC on the market.

No, really, what is the point of this potion now that it's too expensive to make and doesn't guarantee any good finds? I've only used a Rarity Excluder once before and all I've got back then was a troffinch egg and a colored Designer Pot. It was a little underwhelming, I could've bought these items cheaper on the market. Imagine something like this happening now that the Rarity Excluder Potion requires x4 ingredients than before. It would be simply disheartening. This is a total overkill.

In my opinion introducing a new Rarity Excluder for Pixpet eggs alone balances things out already, there's no reason to increase the number of ingredients needed for these potions on top of that. Please don't forget that a Rarity Excluder is useless on it's own, it has to be paired with other potions in order to have any effect at all. Don't you think that making 2 potions to get just 1 item is balanced enough already?