Why would a man want money from a woman, WHY?

I'm shocked to hear that there are a couple cases of a woman (usually coming from a wealthy family or one with a bit more income) getting used for not just sex but money too. My friend fell victim to a long-term scammer, FUA.

That guy already had sex but that wasn't enough. Their relationship lasted for 3 years. He still took half of her savings from one account and isn't returning it back. He left to another state far away.

He was already getting sex and could've left. Men that use women typical are just after sex and that's it. Why would a man want money from a woman? WHY? What is he gaining from that? What purpose?

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Assuming he already earns good or at least average, has a car, has property and really doesn't need our income... why would he be after a woman's money?
Why would a man want money from a woman, WHY?
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