Ravana, the demon king in the Ramayana, was very greedy. Here is a story which exposes the greedy nature of Ravan.
Once, Goddess Parvati said to Lord Shiva that she wanted to live in a palace like Vishnu and Goddess Lakshmi. She complained that she was fed up with living under a tree.
Shiva told Mother Goddess Parvati that palace was not in their luck and it was better to live under a tree, as it was comfortable.
But Goddess Parvati was adamant.
So Shiva built a palace.
The house warming ceremony (Griha Pravesha) was to be done and a priest had to be invited.
Shiva decided to call Ravana who was an expert in all rituals and pujas.
Ravana, an ardent devotee, of Shiva came and performed the pujas and rituals.
At the end, it was the time to give Dakshina. Lord Shiva asked Ravana what he wanted as Dakshina (gift).
Ravana immediately asked for the palace.
Without hesitation, Shiva asked him to take it. Thus, Shiva and Goddess Parvati came under the tree again.