There are many things others do which I don’t believe at all. One of them is paying for advice. Probability of any success with a consulting is so low that it is almost neglectable, in my opinion. You’ll be better off spending money on Netflix or an ice cream. From what I’ve seen and done, there are only two types of advice actually working. Let's dive in.
The simplest one is a free one. The one you get from a friend. You meet some smart person over a cup of coffee and you talk. This person shares his or her opinion on the matter, giving you some interesting perspectives. You pay for the coffee and move on. Responsibility for the next move is all yours.
Another type of good advice is the one grounded in responsibility for the outcome. That is the advice you receive from your dentist. The person who consults you at first is the same person who is going to execute the strategy you agreed on. The decision is still yours because you own the consequences, don't be fooled here. But it works more like an informed consent. Go out there and try to find a dentist who will do any job grounded in another doctor's judgment. Or who will take any action based on your opinion of what should be done. Good luck with that. The routine is simple and well known. You do the check first. It is followed by a recommendation. After that your dentist does what you agreed on. And then you pay when the result seems reasonably good and matches the recommendation. If you disagree in the beginning then nothing happens. And poor judgment on the dentist's side is punishable, as well as bad execution.
Meanwhile, paid advisor is just a commentator. There is no skin in the game for him. He comes, he talks and he gets the money no matter what the score of the game is as a result of his suggestions. And you shouldn’t compare such advising to sports coaching. Any coach is in the same boat with his team. If they do badly his career goes underwater and he takes all the blame. While the consultant just moves on, using your case as another interesting anecdote for his next client. The mere fact of advising to many just means he diversified well. So, please, avoid paid advice at all costs.