1 piece pf body in the mass production is more expensive because:
-you need bigger pieces of wood that is good for production and that
means automatically more expensive because it is not so easy to managed when you need to make many guitars.
small pieces are also fine and there is much more of them than the bigger ones
-usually the body getting cut to 2 exactly for the same reason as neck laminate, Stability.
wood is a biological and "a live" material that even after proper drying still can respond
to humidity and temperature changes causing unwanted results like twists, bows and so on.
to avoid this problem the pieces are getting glued together so
that when one would try to "go to the unwanted direction" the other one
would prevent it because of it wood inner structure.
in other words, one force cancels the other.
