There is one area that I can think of, where the recommendation of _some_ 'experts' can very useful: medicine. It is extremely difficult to find a competent physician. Medicine as is generally practiced is often about drastic procedures like surgery, pills etc. which worsens the overall condition of the patient and often results in huge bills. There are various contributing factors, some of which are not in the physician's control - but the end result is always the same - a really bad deal for the patient. 'Silent' recommendations can often lead to some renegade physicians who are great at treating people but may be at odds with the physician's board. All what I said hold true for dentists also: the truly good ones are very few.