Front Doors in Noe Valley

While I was walking the dog today, I got inspired by color combinations of house colors and their front doors, as I think the first impression should always be something to remember.
a. A classic
b. A nice mellow yellow with the white exterior
c. A contrasting turquoise door with an all black exterior. This house was also featured in the New York Times as a "Skateboarders Dream House". My question is how does a skateboarder afford a house like this? You can see more pictures {here}