I get about 100 views a day from PInterest, on an item that a stranger pinned back in November. I don't even sell it any more, but there it is, drawing traffic to my shop every day. I bless the person who pinned it!
I have pinned a few of my own items, but don't do it often and it has never drawn many views. For one thing, I don't have many followers, and only 1 of them has ever repinned my items. So, unless someone else happens to catch it on the main page of Pinterest right after I pinned it myself, it is not really seen by many people when I am the one who pins it.
But, Pinterest is so much fun!