Why Not Creative Commons with a Caveat?

I realize the whole point is to get a lot of free content out there, especially content that can be mashed up, but why won’t Creative Commons provide an option along the lines of this: Write to me and tell me what you want to do with my music. If I like it, you can do so immediately. If I don’t like what you want to do, you can still do it, but you will have to wait six months. Or, perhaps, you will have to go through six rounds of arguing back and forth with me about it, but then you can do whatever you want. Or you might have to always include a notice in the mashup stating that I didn’t like the idea, with my reasons.

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If a fuzzy crowd of anonymous people is making uninformed mash-ups with my recorded music, then when I present my music myself the context becomes one in which my presentation fits into a statistical distribution of other presentations. It is no longer an expression of my life.

Why not a license that requires you to contact the artist and pitch your mashup idea? Why not allow the artist to put a disclaimer that they don't approve of your mashup?