From the outside, they don’t have much in common; they likely don’t have much shared life experience or common goals. So they probably aren’t dating because they truly care for the needs of the other above their own. If the motivation for the relationship is money for one and young beauty for the other, it’s easy for each party to exploit the other to get what they want. If both parties have the same motivations and interest, it’s a lot harder to take advantage of someone.
It also just feels fake and transactional.