"I own, my friend, once more that the castle where I was born is nothing in comparison with this; but, after all, Miss Cunégonde is not here, and you have, without doubt, some mistress in Europe. If we abide here we shall only be upon a footing with the rest, whereas, if we return to our old world, only with twelve sheep laden with the pebbles of El Dorado, we shall be richer than all the kings in Europe. We shall have no more Inquisitors to fear, and we may easily recover Miss Cunégonde."
This speech was agreeable to Cacambo; mankind are so fond of roving, of making a figure in their own country, and of boasting of what they have seen in their travels, that the two happy ones resolved to be no longer so, but to ask his Majesty's leave to quit the country. (18.21-22)
Candide and Cacambo wish to leave El Dorado in order to better enjoy the status afforded by their wealth. Because there is no such thing as "wealth" in El Dorado, they fail to recognize that they already have happiness there.