Posted By:
runscott"If it is a card, then it feels like a card".
But if it feels like a card, it isn't necessarily a card - I have found very rough toilet paper in rural Georgia gas station bathrooms that feel a lot like W-cards, and even have dotted perforations that mean each "card" was obviously meant to be separated, but these obviously aren't cards (even though mass-produced and obviously not 'proof' sheets).
So there must be some additional definition that has very little to do with "feel". Size might also be a consideration. But I think there are several issues of "cards" that have most criteria used in our definitions, without having all of them. For instance, many legitimate cards don't have player information on the back. Others are larger than traditional-sized cards, but are made of card stock and do have stats, so everyone agrees they are cards.
Supplements, for one thing are "supplements" which is a category of baseball collectibles, and not the same as "cards". Also, they are very large, blank-backed, and have no player information on the back. For these reasons, I don't consider them cards.