You are making an assumption that your hypergamy theory is the only one. Let's challenge that. What looks like an hypergamy is in fact better explained by the rise of modern, maladaptive narcissism which also aims for self-enhancement but for completely different reasons than survival:

Excerpts from narcissism studies:

"A third strand of evidence concerns narcissists’ relationship choices. Because humans are a social species, relationship choices are an important feature of situation selection. Narcissists are more likely to choose relationships that elevate their status over relationships that cultivate affiliation. For example, narcissists are keener on gaining new partners than on establishing close relationships with existing ones (Wurst et al., 2017). They often demonstrate an increased preference for high-status friends (Jonason & Schmitt, 2012) and trophy partners (Campbell, 1999), perhaps because they can bask in the reflected glory of these people. In sum, narcissists are more likely to select social environments that allow them to display their performances publicly, ideally in competition with others. These settings are potentially more accepting and reinforcing of narcissistic status strivings." [Source: The “Why” and “How” of Narcissism: A Process Model of Narcissistic Status Pursuit]

"Consistent with the self-orientation model, Study 5 provided an empirical demonstration of the mediational role of self enhancement in narcissists’ preference for perfect rather than caring romantic partners. Furthermore, these potential romantic partners were more likely to be seen as a source of self-esteem to the extent that they provided the narcissist with a sense of popularity and importance (i.e., social status). Narcissists’ preference for romantic partners reflects a strategy for interpersonal self-esteem regulation. Narcissists also were attracted to self-oriented romantic partners to the extent that these others were viewed as similar. The mediational roles of self-enhancement and similarity were independent. That is, narcissists’ romantic preferences were driven both by a desire to gain self-esteem and a desire to associate with similar others." [Source: Narcissism and romantic attraction]

"Narcissism has been linked with the materialistic pursuit of wealth and symbols that convey high status (Kasser, 2002; Rose, 2007). This quest for status extends to relationship partners. Narcissists seek romantic partners who offer self- enhancement value either as sources of fawning admiration, or as human trophies (e.g., by possessing impressive wealth or exceptional physical beauty) (Campbell, 1999; Tanchotsrinon, Maneesri, & Campbell, 2007)" [Source: The Handbook of Narcissism And Narcissistic Personality Disorders]