QOD: Why do you think honeydew is the money melon?

Bunny Blue owned a honeydew,
A honeyed brew, and a watermelon.

A sunny Sioux with his funny crew
Offered Bunny Blue a trade of melons:
Their runny stew for the honeydew,
Promised money, too, and a ripe muskmelon.

But Bunny Blue loved his honeydew,
Though he’d trade the brew and the watermelon.
Their refusal cued, they bid fond adieu.
Next dawn, bedewed, found Blue lacking melons.

Sonny Crewe said the honeydew
Was bought and sold on the old Magellan
Poor Bunny Blue wept a tear or two
Having lost his due to a band of felons.

Now Bunny Blue sits and drinks his brew
Rues his honeydew as lost money melon.

Now listen, you, here’s the residue:
You get a honeydew, go on quick to sellin.’