And this just shows that you've never even read the series to begin with. If you had, you'd have known that the cards weren't even introduced until volumes into the series. Unless you're talking about GX (which is awful), you can't say that Yu-Gi-Oh was made for marketing purposes when the product wasn't originally part of the story... and wasn't for a long time.ok here is my opinion :
making a story to market a project is just sooo cheap ... they just use people mostly children to their own benefit ..& thats include "pokemon" & "yugioh" and many others ...why do you think pokemon & yugioh is popular ???
(Maybe this should be moved to Misc. Series? :/)