Which Is Harder: Warning a Reader Off or Making a Recommendation?

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For me, it is harder to make a recommendation than to warn a reader off.  The reason is because if I make a recommendation and the person acts on that recommendation, I know she has spent time and money based on something I said.  Whenever I give a recommendation, I am thinking that this book is worth it to me and I hope it is worth it to you. I know that everything that I like isn't...