Having invested in Luoxia Manor for several years, the circumstances back then were not like now; there was no trouble of a grand direction, it was purely an emotional investment.
Based on Yue Hongling's ability to single-handedly defeat the Black Miao King's Corpse Puppet, she definitely possesses the capability of the Heavenly List, not the Earth List. Having someone from the Heavenly List within a force, do you know what that signifies? It qualifies one to contend for supremacy—the case of Li Shentong is the best example.
Under normal circumstances, considering the current relationship between my sect and Yue Hongling's, if there was some issue outside that was problematic to resolve, or if the family had offended someone we could not afford to offend, asking Yue Hongling for help would undoubtedly be met with immediate assistance. Securing an ally of the Heavenly List was indeed a successful investment.