I had a chat with somebody after visiting a collector of star trek items.
I've little tendency if any at all to collect things myself. But the other person said she had stopped collecting things in the physical world and had started making virtual collections only. She used pinterest for it, making sure to have the best pictures in it, the best cover picture etc. putting a lot of work into it from the sound of it.
She had a whole theory about how it saved a lot of money as she'd be happy with collecting the images of e.g. jewelery and shoes instead of actually buying and owning the items.
This struck me as that it also means that if you sell stuff that those people who like to collect things buy, pinterest might eventually become your biggest competitor. Just consider what happens when more people think about or start to use pinterest as a virtual collection that replaces their need to have and own physical collections.
Sure it's early - and the person I was talking to is heavily into the virtual side of things. So I'm postulating it as a thing for the future, a future death of collectible value. Or a future battle between pinterest and the like and those trying to sell collectible items.