I always use the nighttime EMH at Magic Kingdom on Sundays on my trips, frequently till 3am. The park is usually pretty quiet from 2am on but its the best part of the day for us, As for spending, - maybe if they left a few places open guest spending would be higher. You can't even get a cup of hot chocolate or coffee on a cool night without heading back out to Main Street. And a popcorn cart would go a long way to that I haven't eaten since 10 or 11 peckishness.
Oh and there is always a line for a picture with Mickey and Minnie behind the castle even at 2:55!
Oh and there is always a line for a picture with Mickey and Minnie behind the castle even at 2:55!