Who is the target customer for this feature? Do I pay to make collections, to view them, or both? If I have to pay to view them, what would make me want to do that? If I have to pay to make them, why would I want to?
Only to create. They'll be public and available for anyone (user or not user). My target market for collections is Pinterest users.
But Pinterest users don't pay anything to make collections?
That's why it's full of low quality content and spam :)
i stopped using pinterest because they stopped displaying anything unless you were logged in. they are clearly using it as a mechanism to drive sign-ups, though - do you have any similar but less annoying plans to exploit network effects?