+1 would be interested to see the actual study and can’t find it. There’s apparently a lot of work on the two effects mentioned here, Endowment Effect & Regret Minimisation. But it’s psych research so last time I heard, you could safely ignore about 40% of published papers.

https://link.springer.com/referenceworkentry/10.1007/978-1-4...

https://www.jstor.org/stable/1942711