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The average price of an item should be valued on how much it sold for previously, not how much its generally listed for. A lot of the confusion with trading items is with average marketplace values being overpriced.
Hello there! Your suggestion is something we'd love to change eventually, but it won't be really soon, so I'll proceed on labeling this as on hold. Thank you for your feedback, we love to read the community's thoughts!
I am happy to tell you that this suggestion was completed in the recent patches and improvements! The marketplace now displays the average price that an item has been sold for in the past, giving a more accurate value. You can read the recent patches and improvements here. We hope you enjoy the new addition!
Thank you once again for creating this suggestion and I hope you have a fantastic day!