I can see why someone might want to buy them - just to own an image from a great film, the original of which is completely out of reach (for most of us).
I remember when I first started going to film fairs, I bought repro posters of much lesser quality but for only a couple of pounds each (which makes a big difference). Eventually though, I found what attracted me most was owning original release paper which gave me some sort of connection to the time when the film was first shown. The S2's, however good they might be, just don't have that quality and I, personally, wouldn't buy them for that reason.