Today's technology has given rise to new opportunities for reconsidering your event's priorities. Where before it was next to impossible to logistically achieve a balanced volume in a large area, or one with many rooms, nowadays, not such a problem.
If by using a microphone the attention of those in attendance can be more easily captured and maintained, then a wireless transmission to a remote receiver is a means to creating and sustaining the party's focus, and actually, that's what we're talking about!
Naturally, in a large venue with many folks in attendance, sending a signal to the back of the room or way off to one side contributes greatly to helping everyone hear what's being played and keeping them informed. In a cocktail setting, the objective is to keep the volume as balanced and even throughout the entire area, without blasting one section and simultaneously being inaudible in another. The volume of the wireless signal can always be controlled independently from the main mix so the music can still be pumped up in proximity to the dance floor while being set to a level that won't intrude on conversation in a section where people are socializing.
The point is, the appropriate audial focus can be attained by taking advantage of state of the art approaches to production—and there's no excuse not to!