So they loved it. I am writing this log mid game just to say that they are absolutely loving the fact the dragon is a real threat. After game after game of them just playing through dungeons now that they are running against a REAL dragon they are so shocked. They have been arguing over the last few hours as to how to deal with the fact that they are stealing wealth from this beast and now it is hunting them.
So let it be a lesson to all DMs, always include a dragon. More tomorrow as I have to return to the campaign.