They also bring down the value of regular rare holographics. That's why I never really liked them from the start.
But I've gotten used to them. Just have to be easy on them so they don't scratch. I'd much rather them have the sparkles like the shiny Pokemon in IFDS instead. At least you can read the card, and it's something new. I like the shiny art idea, but lets not make them avaliable in every pack. That would make them not worth much at all. (And it would be a lot of work making shiny art for every card, but it would be cool.)