Ink of the Sea = 2 Azure Pigments
Snowfall Ink = 10 Ink of the Sea = 20 Azure Pigments
Darkmoon card = 6 Snowfall Ink + 3 Ink of the Sea = 63 Ink of the Sea = 126 Azure Pigments
Nobles card = 4 Darkmoon card attempts (Presuming that each deck has equal chance)
Nobles Deck = 8 Nobles Card
Nobles Deck = 4 darkmoon cards * 8 Nobles cards need = 32 cards * 126 Azure Pigments = 4032 Azure Pigments
1 Mill of each type of herb:
Adder's Tongue: 2-4 Azure Pigments 100% 1-4 Icy Pigments 50% = (2+4)/2*100% + (1+4)/2*50% = 4.25 Azure Pigments
Tiger Lily: 2-4 Azure Pigments 100% 1-4 Icy Pigments 25% = (2+4)/2*100% + (1+4)/2*25% = 3.625 Azure Pigments
4032 / 4.25 = 949 stacks of Adder's Tongue+
4032 / 3.625 = 1113 stacks of Tiger Lily and lower
5000 gold per Nobles deck / 1000 stacks of herbs = 5g per stack or less to make it worth it.
Now that not entirely true because you would also presumably get at least 1 of each other deck in the process of getting the nobles deck. So 500 for each of the others is probably generous, but makes it about 6.5g per stack of herbs. Now this also doesn't take into account that you aren't guarenteed to get each number only once so you will probably have to make significantly more cards to get a full deck. I'm sure my math is all wrong, but it looks right.
So not likely to be worth it considering how long it takes to mill it all down.