I have to say I really love the coins and they are a great addition to some figures but as a very disciplined collector now (to save money and marriage ) I don't collect them because if I started I would have to back collect every single one of them even if I didn't have the figure, yes this is called OCD. If a figure that I buy comes with a coin it gets sold or given away.
I have contemplated what to do with them if I did collect them, keep them in the folder or take them out, LP's picture of them loose looks amazing and I think this would be the way to go because this actually displays the coin not just a cool cardboard wallet.