Couldn't agree more .. though most things in life are easy "if you know how", so it's more a case of being bothered (or having the time/inclination) to learn.
But then I would say that .. I'm "in the trade" as it were, though not so much a shop for the general public
I think the red faces would come from the amount shops charge for such easy jobs that require little skill .. but a capitalist society charges what the market will bear, so pricing rarely correlates with skill level
I'm not defending it .. just saying that's the way it is .. we pay a car mechanic to change a lightbulb, or a plumber to change a washer .. some of that may be so we have someone to blame if things go wrong, but most is just time saving.
Most people charge a business more than an individual for the same service .. this has nothing to do with the job itself, it's priced on what it's worth to the customer, a home user can do without his PC for a day or two, a business can't, so you can sell things like "priority" to a business along with skill level. I mean a business can shop around for someone who charges less to do a simple job like change an optical drive but they tend to call "their computer guy" because his skill level is a known quantity and it's sometimes cheaper to get someone over qualified that's on speed-dial, than to waste time shopping around.
It's a crazy old world