We don’t allow schemes that buy and sell Pins or pay people per Pin, follow, etc. We know that some popular Pinners have relationships with approved affiliate networks or participate in paid social media campaigns, and that’s still okay, as long as they’re not being compensated for each action on Pinterest.
So if you're in a deal to earn $1 every time you pin a corporation's products, you're out of luck. But if you’re a highly influential blogger in a five-figure partnership with a brand, making money is A-OK. Here's more:
A business can pay someone to help them put together a board that represents their brand. For example, it’s okay for a guest blogger to curate a board for a local boutique’s profile. We don’t allow that boutique to pay the blogger to Pin products to her own boards.
A person can be given commission by an approved affiliate network. For example, it’s okay for a blogger to get paid when someone purchases a product that blogger has Pinned. However, we don’t allow the blogger to be paid just to Pin.
In other words, Pinterest isn’t trying to keep brands or bloggers from making money. It just doesn't want anyone paid for filling up its network with garbage images.