Honestly, the sell list feature should be removed altogether.
There are too many fake users who have added nearly every game on the database to their sell list "retrogamingdad" for instance. The sell list feature isn't intuitive. You can't move from collection to sell list, you have to add manually. Same goes for moving from sell list to collection. Too many folks don't use that feature at all, and the few that do, don't keep it updated.