Man is a greedy creature. Always hungry for more. Always wanting, desiring, asking, needing. Never satisfied. Never happy.
He is a fickle creature. Impressionable. The grass is always greener on the other side after all. So he wants what the other one has, not seeing the wonders he already possesses.
And he will do anything to have it. Keep it. Possess it.
And before he knows it, what he had and saved, is lost to him too. Forever.
Because man isn't just greedy. He is also foolish.