Well, I guess the "How did you even know there was an opportunity?" bit could be considered "selling", but all of the rest of that is stuff that needs decision making and agreement on both sides before the bill gets paid. And somebody other than the developer is going to have to do and/or manage it all. Who's paying for that time?

Or do you honestly think 6 hours worth of coding @ $100/hr is all a job like that requires?

Have you ever worked with a government department?