Why did the guests avoid the seventh room

All the other rooms were decorated with bright, vibrant colors. The last room was black with red windows. Guests avoided this room until the ebony clock struck midnight when a new guest appeared, dressed more ghoulishly than his counterparts. His mask looked like the face of a corpse, his garments resembled a funeral shroud, and his face revealed spots of blood suggesting that he was a victim of the Red Death. When the Prince confronted the new "guest", he died. Poe played off the fact that the Prince, Prospero - like propserous, was avoiding the plague outside, but the Prince's wealth didn't even save him.