My regular curmudgeon note.
I have no idea what is going to appreciate over the years. However, my experience has been that posters that are promoted as future collectibles seldom are. Goes for other collectibles as well. People buy up and hoard the 'collectible' ones and in ten years there is a glut. Holds for halmark, plates, Beanie Babies and even barbie. My daughter was collecting Barbie 20 years ago. I told her to buy a couple of cheap Malibu Barbies and pack them away with the others in original box. When she sold a couple of years ago they were the big priice items while the 'collectible' ones barely got sticker price.
I have personal experience. Back in the early 90s, Cindy got caught up in the 'collectible' poster thing. She bought the hot arthouse movie of the year, which was the Three Colors Trilogy (Red, White and Blue). These days, each is a solid $10 poster, less than we paid back then.
My guess is that Black Swan is a film destined to be forgotten in 5 more years. Bruce's archives seem to show it is already declining over prices from 3 years ago.
OK, I've said my piece. Now you can all call me an idiot.