The Gra in Mishlei [5/ 9] on the pasuk אוהב כסף לא ישבע כסף [he who loves money never is satisfied with money] says that the תאוה for money is different than all other תאוות. When someone is hungry and eats, afterwards he is no longer hungry. When someone receives the הנאה of מעשה אישות, afterwards he is satisfied and [at least for a short while] has no תאוה for more. However, when someone has a תאוה for money, even as he is receiving the money and right after as well, he has the desire for more. It is NEVER enough.
אוהב כסף לא ישבע כסף.
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