I'm pretty sure the "blue roof" thing is planning ahead for insurance fraud. After disasters, buildings that are still standing but have roofs damaged will have blue tarps given to them by FEMA to both cover the damaged area and make it easy to do estimates of damages by air flights.

Some guy counts the number of blue spots on the zip code and the FEMA cash machine prints money.

When you are at that level of Richistan, you learn all the asshole tricks like this to steal money you wouldn't otherwise be entitled to.