Two of the main resources people have are time and money. The world offers many opportunities to trade one for the other, at widely varying rates.
Where do you see people trading money for time at unfavorable rates - spending too much money to save too little time? What things should people just DIY?
See also the flip-side of this post, "what are you surprised people don't just buy?"
I think you're being too risk averse here. How do you know you hired a competent person? Can you really be sure that they didn't do something stupid? Are you sure you won't need the money you spend on them for something else? Obviously you should do a cost benefit analysis, but in the cases I mentioned, the costs are way too high for basically no benefit besides saving a small amount of time.
You know that you hired a competent person because they