"Cultures that still have dowry systems, still "sell" off their daughter for monetary gain."

Um, no. That´s the cultures that have bridewealth systems...

"As to whether or not the girls like their husbands is of little consequence. The boy or man who marries his child bride can now be the master of his own house."

Does it mean that getting a wife must be strictly timed to coincide with getting a house?
That is, a man with no wife is no master of a house without a wife to do women´s work (and a widower is screwed), while marriage assures that the child bride has a house whose mistress is she and no one else?