Board Thread:Off Topic/@comment-226878-20150311082119/@comment-226878-20150313061600

Well, in the video games there is a charge for fusing cards dependent on the rarity. Obviously purchasing the upgraded card itself would have to be much more expensive (or simply "not cost-effective", as in buying a whole expansion pack for a "chance" to obtain it) otherwise no one would bother sacrificing their cards for the new one.