Not so fun fact: The absolute richest dragons in all of fantasy, excluding Smaug, only have a net worth of several hundred million dollars. A Red Elder Wyrm will have, on average, around 2.5-3 million gold pieces of wealth, with an absolute maximum of 5 million gold pieces. That means that the absolute greediest, and richest type of dragon, by far, only has between 100,000 to 500,000 oz worth of gold.
Smaug being the absolute outlier because he had somewhere between 5 to 10 billion dollars worth of gold.
Now if you are wondering why I'm making a big deal about this, it is because 500,000 oz of gold is only worth about 1.1 billion US dollars. But that is the absolute outlier of the greediest type of dragon that there is. Still only looking at Chaotic Evil Red Elder Wyrms, the average would only be about 3.5 million gold pieces, or a mere 350,000 oz of gold. That's only about $850,000,000 and that is just the most average of the absolute greediest manefestations of greed that our limited minds could imagine. Most dragons would be absolutely fine with between $1,000,000 to $10,000,000. The literal manefestations of greed don't need more than $10,000,000 according to every treasure table.
Those people that have more than 100 million dollars have already passed the greed alignment chart into Chaotic Evil. They are damn near caricatures of dragons at this point.