The advice indeed appealed to Ahasuerus. Not only would he find a new queen, but his harem would also be increased with many beautiful young girls.
Israelite kings were forbidden from having a harem (Deuteronomy 17:17). Their power was limited by God’s law and, if they transgressed, they could expect a prophetic rebuke (see 2 Samuel 12:1–12). Pagan kings, however, were not restrained in this way. They were taught to view themselves as demi-gods, and the people under them as their possessions. Ahasuerus was free to take as many young girls away from their homes as he wished.
Yet in this oppressive campaign, the Lord was still at work. Without knowing it, the attendants were helping to carry out his plan: saving his people.
4 And let the young woman who pleases the king be queen instead of Vashti.” This pleased the king, and he did so.