For most retailers the sale of estate merchandise is a very profitable category. I frequently see margins approaching 60-70% in these cases.
I think displays in these cases should be a bit different that in other parts of the store. I suggest the displays can be a bit more dated because the customer already feels he/she is looking at bargain items. It is also useful to use price tags with “was/is” pricing. The “was” price establishes the psychological anchor number and the “Is” price looks like a big bargain.
I frequently use antique leather photo albums as risers in these cases. I also use ceramic hands and antique jewelry boxes (Sourced on Ebay) as well.