While the Taschen book at Wu-Tang album are multiples, they're still gimmicks (something I almost always embrace as a viable marketing ploy).
They are taking something that could easily be widely available for less money and making it more precious.
I don't really have a Deep Thought question to go along with this. I just believe it's worth thinking about whenever you worry about being too commercial in your own art career.
And, yes, using the photo here of my cat, Jack, however precious, is a gimmick.