There are certain cards I will bid on whenever I see them because I feel they are undervalued and would not mind owning them at my price point. I consider that smart trade fodder stockpiling. There is one card that I hoard, 1928 Exhibit Ray Miller:
No variation will get past me if I see it and I will usually win any duplicate of cousin Ray's card as well.
I can understand the frustration of people who can't work whatever project they are on because of the hoarding, but that just means you have to out bid the hoarders. I got outbid late last year on what would have been card #10 for me.
On the 1969 Jackson, I read that RJ was collecting a copy for each of his home runs, which he intended to autograph and market. As I recall, he got a few hundred and then the Oakland Hills wildfire destroyed his home with the cache of cards in it. Doesn't seem to have affected the supply...
Last note, on Shag Shaughnessy, I always thought that hairdo on the card was a prank but now I see the picture of him and holy crap, he really does have that 'do! I guess if I had a head of hair like that I'd wear it like bird plumage too. Won't have to worry about that unfortunately...