I agree with this, and perhaps that is why there are no affiliate links yet, from that list (and my brief, over-the-shoulder viewing of Pinterest) I only know of some "nails" postings that either contain in the picture or in the text/comments, the name of the product used in this case.

Users are not pinning the direct BestBuy link to their new headphones, but they are pinning "My new pair of Grado xxxxx are awesome!". Thats where Pinterest has the data, and could go to work to provide easy access to those products.