In short, because these shots SELL HOUSES FASTER AND FOR MORE MONEY! Many, many homes will look better when photographed at twilight. There's something everyone loves about seeing an image with the glowing lights inside and a beautiful sunset. It's striking and colorful, and all in all a very appealing look for a real estate marketing campaign. The other benefit with a twilight shoot is that it will make that particular house stand out far more strongly when compared with other homes currently for sale.