不起作用的原因就是事实上出版商提供了相当有用的服务：他们编辑书，然后宣传它。
The reason it doesn't work is that the publishers do actually perform quite a useful service: they edit the book, then they publicise it.
限制：如果你有了优秀的产品，你就要去宣传它然后…除非广告预算不足，否则只有天空才是你的界限。
Limit: If you have a good product you need to advertise it and then... the sky may be the limit... or you budget for running the ads...
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