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Grain is easier to cultivate, is much less demanding with regard to soil and climate, and produces a higher yield per acre. Moreover, dried grain is easily stored, so that beer — in contrast to wine — can be prepared at any time during the year.
These advantages taken together offset by a wide margin the disadvantages of a more complicated production process, and, generally speaking, beer is less expensive than wine.
Reference
A closer look at the chemical role hops play in the beer-brewing process shows how beer owes its marvelous flavor to a great deal of chemistry
Also of Interest
Beer owes its marvelous flavor to a great deal of chemistry