Thus is the power of relationships, which often goes undervalued in quantitative analysis. For a one-off job, you could pick the most skilled person in whatever trade to do it for you, with unlimited budget $X, and still be unhappy with the results. Because there is no relationship.
Whereas, if you pick someone who your friend uses regularly, by comparison, your job is no longer work $X to the tradesman but the sum total of $X plus ALL the future business from your friend, who will leave if the tradesman does you wrong.
Whereas, if you pick someone who your friend uses regularly, by comparison, your job is no longer work $X to the tradesman but the sum total of $X plus ALL the future business from your friend, who will leave if the tradesman does you wrong.