One of the repeated words in Part III is "poor." It is clear that Judy Jones can not or will not marry a poor man. This shows how elitist and superficial she can be. But this also gives Dexter the indication that if he is to stay with Judy, he must also avoid being poor. Like Fitzgerald's more famous protagonist (Gatsby), Dexter believes he will have to be a wealthy man in order to attract the woman of his dreams. On dumping her most recent fiance, Judy says:
He didn't start right. You see, if I'd thought of him as poor--well, I've been mad about loads of poor men, and fully intended to marry them all. But in this case, I hadn't though of him that way, and my interest in him wasn't strong enough to survive the shock.
The fact that she "intended to marry them all" suggests that she had been dispassionately looking for a rich man who she hoped she would love. It makes her seem like a businesswoman interviewing prospective employees. Aside from her beauty, this power that she has over men is what lures Dexter in. At the end of the story, when she loses this power, Dexter loses his glittering infatuation with her. The glamour of Judy is part of her allure. Being poor or associating her with being poor destroys Dexter's perfect image of her (and Judy's image of herself) as a beautiful, glamorous woman.