I think slippery slopes apply to logical arguments. In this case, I'm making a subjective judgement about the value of knowing how someone designed something co

I think slippery slopes apply to logical arguments. In this case, I'm making a subjective judgement about the value of knowing how someone designed something compared to how much they are charging. Collectively, the public could make this judgement and would draw a line, for each product. For me, apples products fall below that line, so I would grant the copyright, but the PRC products fall far above the line, so I would choose not to grant the copyright.