I did put my brewed beet on market at small profit and so far only one was bought... For me to gain more CBM than I spend on quests, I need to sell the finished beer at least double the price than pub gives.

When quests don't give enough ingredients, I buy them bulk on market as the price of ingredients go up quite fast when seller changes.

For me, the minimum viable sell price at market for finished beer is:

Grey - 10 CBM
Green - 25 CBM
Blue - 50-75 CBM
Purple - 100-250 CBM
Orange - 500-1000 CBM

More I need to buy ingredients on market, higher the minimum viable sell price is for blue (outstanding), purple (excellent) and orange (outstanding) quality.

On the other hand, if I get better ingredients from events, the minimum viable sell price is lower.