For M:tG cards, yes, I think so. I have to pay something to get the cards in the first place, and I guess you could see the cost spread over each use of a card (uses which, btw, are limited in time- there's only a limited number of times I'll get to include a rare card in a deck, draw it and play with it, until I get bored or it rotates out of the most popular formats I'm engaged with).