Do you get a lot of demand for 1921-D Walking Liberty half dollars? I have been at one monthly coin show 4 times as a dealer, (snowed in this past time) and in all 4 times, there have been multiple people walking around, looking for a 1921-D half dollar. As much as I want to get one to resell, and with them being right around Greysheet, I simply can't bring myself (at the moment) to pay $175-500 for one of these. What are your thoughts on the situation?
Well, being the key to the series with the lowest mintage at 208k and only an estimated 10k of them left in existence (in any grade), AND everyone wanting one, I think you're lucky they are still that cheap. What should they cost at this point? It's an open market. We just had two ribeye steaks that cost $40 and had to cook them myself. God help you if you go to order one at a restraurant. I believe that's outrageous too but that's where we are now. Alternative: I can protest and not have any steak. My thoughts are, is anything getting cheaper? At least we have the internet now for finding many examples and price competition. I'll go out on a limb and say this is as cheap as those halves will ever be.
Diddo what @Vess1 said, supply and demand. I have a lot of coins where there are 5 or less known specimens but since they are "anonymous" issues few people want them so I can usually purchase them at cheap prices. It seems that they need the 21-D to mark the checkbox on their list.
When I was a dealer, I made specialty for asking for and filling want lists. It was a good way to do business because the vast majority of times, the coin was sold as soon as you found it. If the want list person didn't take it, I found that I didn't have much trouble selling the item later. This is especially true for key date coins, like the 1921-D half dollar. Went I was a dealer, people seemed to want 1820 half dollars for some reason. I found that if I could buy one at a fair price, I could turn it over very quickly.