As someone who already has way too many pins (but always needs more) I was surprised to see a loot box option for pins. The first two that arrived were the "intro" ones that everyone gets sent, and then after that I have been getting the monthly packages. It's like getting a present in the mail each month and knowing you're going to like it.
Some pins have the standard pin backing and some are now magnetic, which was an interesting surprise. The magnetic backed pins are on a different board due to this but still happy.