That morning, Rick and Zoey were the first to arrive at the Wilson family villa. Rick even hinted to Samuel about asking Rita to give him the dragon. Samuel found it amusing and a little ridiculous—sure, maybe Rick could ask for money, but a dragon?
Samuel was very clear on this: if he ever had a dragon, it would go to his grave with him, not be given away, let alone sold. Asking for it? Absurd! That's the kind of request that could ruin relationships.
All Samuel said was, "You do know how stingy your sister is, right?" effectively shutting Rick down.
Rick had nothing to say in response. In the past, when they schemed to get money from Rita, they had to take a roundabout route. Asking for a dragon? Unless they killed Rita, but even then, he couldn't beat a level 14 dragon anyway.