From a marketing point of view, it can be hard to get your head around how pins are counted, and how it converts into traffic, so let me give you a little run down.
You post an image to a board, where other people can browse, see what they like, and either like it, or pin it to their own board. This image links back to the webpage that you pinned it from, and most people will click through and read the post. If the image is an infographic, and all the information they need is on Pinterest, then they probably won’t bother so much. Hold a little something back (although Pinterest does make long images very narrow when you click on them).
So lets say I pin something to my board, and it gets repinned 10 times. That counts as 10 repins for my pin. If someone takes one of those repins and repins it again, that does not add towards my total number of repins, because it was pinned from another source.
I’ll give you an example.
Choosing a board at random, I can find a pin with 7 repins. If I have a look at who’s repinned my pin, I can see that the majority of them receive just a couple likes and repins. Except for one. One of them has 26 likes, and 103 repins. And I could go on further, and look at how many times it’s been repinned from there, but I think you get the picture. It can start to spread like wildfire.