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It was a published study. In academia, that is the goal, and the goal was met.

Do you really mean to ask why didn't the study authors monetize this? If so, you are looking at academia through startup-tinted lenses.

Everyone is okay earning more money.

It's not about monetizing this. But people who know about this, don't they think it could really help lots of people ? and if so aren't they, especially in the fields of psychology, motivated by such things ? Because popularizing this might be the most valuable thing they could do in their professional lives.

Unless it is fundamentally wrong. In which case, it could be a major mistake. So you let it exist for a while and see if there is any counter-research or alternative explanations that have been overlooked.

They were busy with love rather than work?

The part about staring into someone's eyes is pretty well known. I remember hearing about it in the context of something that cults do to try to build a false sense of intimacy. IIRC, there's something about staring into someone's eyes, particularly at a distance of a foot or less, that we subconsciously associate with those closest to us which causes us to suspend our defense mechanisms.