The average price for Beer in retail stores in the last few days is $14.50.
Corn can be produced for $0.32 at its lowest. The real value of corn mostly depends on the value of water and seeds. Looking at the current market prices for water ($0.17) and seeds ($0.29) the real value of corn is $1.99. Assuming a price of $0.10 for water and $0.20 for seeds the value of corn would be $1.20. If you manage to sell this corn for the current market price (+/- $2-$3) the value of corn would be higher.
Beer can be produced for $4.48 at its lowest. The real value of beer mostly depends on the value of corn. The current value of corn is $1.99 making the value of beer at least $19.90. Assuming a value of $1.20 for corn the value of beer would be at least $12. If selling corn for the market price the value of beer would be +/- $20 - $30.
So, why is beer not profitable?
The problem is water. The price of water is too high. Just by making water cheaper (from $0.17 to $0.10) the value of corn would drop enough to make selling beer slightly profitable. Currently, selling water gives a minimum profit of $25.000 a day. Even when the value of water is $0.10 a liter it's not possible to make more then $4.000 profit a day selling beer.
Another way to look at Beer: 1 Beer = 100 Water
The same is true for other products;
1 Cattle = 650 Water
1 Pigs = 650 Water
1 Lambs = 550 Water
Tip: Even when Water sells for $0.10 on the market you can make a minimum profit of $15.000 a day.

Have Fun!
Roach