Wait so the Bible tells a parable about a man who had multiple wives, the man was not punished for the multiple wives (silent agreement) and in some instances is praised or rewarded in the Bible (not for the wives, but for something he did/witnessesed).
During the time the Bible was written, (both of them) it was a common practice to have multiple wives. It is a modern concept for that to be a sin. This is shown by the many instances in the Bible where men, who had Multiple wives, and the Parable wasnt focused on his polygamy.
If the Bible, and God didnt want man to have multiple wives (once again a common practice) it wouldnt have cast the men who practiced polygamy in a favorable light.
its a simple concept.