These aren't psychologists. I've never disputed that game companies hire monetization specialists. I've disputed that they hire psychologists (people with an advanced degree in psychology) to work on monetization in a capacity that involves utilizing their academic background and knowledge.Don't have her name to hand, but she worked on Wildstar and SWTOR as a monetization lead and was hired by ESO/ZOS for the same role. She got a lot of flak from the playerbase when loot boxes were added to ESO after her hiring (something SWTOR had used to generate masses of income).
Here's the kind of job listing companies post for it. It isn't devs and producers experimenting themselves in these cases, but specific monetization departments separate from the game dev team: https://www.gamasutra.com/view/news...os_is_hiring_an_ESO_Monetization_Designer.php
Real-world monetization teams comprise designers, product managers, and data analysts. These are generally people with a business or finance background.