Just putting this one out for comments.
With 20000+ listings I spend much of my time moving items, that have sold, and watching the wheel of death for long periods.
I have mentioned this before BUT if I had a PREFERENCE set such that GS DOES NOT list an item if it is marked as SOLD, then I could keep the sold items and those I wish to list in the same group. Maybe move them to a group one level lower in the group hieracrchy.
I do not list list my items as “X Copies to sell” because my items vary so much in condition I usually have to add a new image to each copy of a sold item.
It may also remove the need to search fo an item before making a copy. Another function that can take a long time of Spin.
Does this make sense or would screen captures help?