If your hotel concierge recommends a restaurant, can you trust the tip? Or does the concierge stand to gain from recommending one place over another?
What I found is that travelers are pretty cynical about concierge recommendations, and they assume that most concierges accept comped meals once in awhile. And travelers wouldn't be surprised if some hotel concierges actually earn hard cash for steering guests to particular eating and drinking establishments.
According to a Wall Street Journal article, "hotel-employed concierges receive commissions of up to 15% on some bookings - say, from a limousine company." But the article notes that they have an incentive to keep guests happy so they'll return to the hotel.
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Source - Yahoo