I think Spine cards, have more or less to do with the Record industry, then the CD industry. However, it also contains alot of useful information, and should be considered a part of the packaging of a product. As somebody mentioned, many Spinecards have information that would clutter the art. As with most Western products, we obviously know this by heart, ( and I am sure get annoyed with seeing "includes free demo, blah blah, with a big bright sticker ) In fact that is what a Spine card does. Instead of sticking crap all over the box, let they did before, you have one thing.
Spine card + booklet + cd + bonus ( stickers, fill out card, advertisment ) = more value.
Without a spinecard the game is not complete, however that should not stop you from making a purchase. I see three kinds of buyers.
1. The person who wants to play, but have a higher valued product.
2. The collector who wants gleem at their aquired unused goods ( person from Kirby 3 ).
Otherwise, the PCE would be a useless hardware, and we could just emulate, and run everything off flashcards. It is like going backwards in time for me, emulating on the computer
I hate more the buying something without a spine card? Something that is sealed. Because I know it has a value far more greater, but then I am stuck gleeming at it all day long. Then what is worst, is when the god damn case is cracked inside the sealed game, or you can hear something inside that is broken, or moving around. :-#