The purpose behind asking that the question be answered by EA is because I have seen a potential answer, but every time that I have observed that potential answer it was from a source of questionable reliability. I want the answer to come form a source of reliable authority. In a customer service chat I have asked EA for the rules governing how they determine the Quicksell Values of the cards and they refused to answer. I also asked if the determination of Quicksell values is determined using any other factor other than the OVR of the card and they refused to answer.
The best source that I have seen on Quicksell values is madden-school.com, which indicates that Quicksell training values are tied directly to the OVR of the card with no other factor ever being in play: https://www.madden-school.com/madden-22-ultimate-team-quicksell-training-values/
In the absence of an explanation from a reliable source, it is my current belief that my Madden EA account is being targeted for some reason and I would like an explanation and/or for that targeting to stop. If you can provide your answer while providing it with where and how you obtained the answer--and that where and how is reliable--then that might be helpful.