Kickbacks for good reviews?

A friend of mine was caught in a trap recently by a journalist. Despite receiving a list of pre-approved (and friendly) interview questions about his luxury goods company, he soon found himself in an interrogation about the corruption of luxury retailers providing kickbacks in exchange for good press. Out of distaste, he ended the interview. 

So here’s my question: Do hotels pay to get good reviews in guidebooks? And if so, who’s to blame?

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