As one who eats breakfast out at least 10 times as often as dinner, $10-13 is the sweet spot for a really good breakfast, and that usually means eggs Benedict or a really special omelet. I have never once had better by spending more, and $6-7 is fine for a simple plate of eggs, potatoes, and meat at Denny's or most any typical breakfast haunt. The $25-50 brunch buffets can be good, but for breakfast I generally don't want the prime rib/seafood/vast multitude of items that makes them expensive.