I know why. The yellow base coat paint is EXPENSIVE. When I couldn't find any touch-up paint locally, I went to have a pint (the least they will mix) mixed up at my local paint store. The yellow paint in PPG brand was $ 59.80 a pint. If you do the math that's almost $ 480.00 a gallon. I figure it would take 2-1/2 to 3 gallons to paint an SSR. The other colors are much less expensive.