Do shops still sabotage cars for profit?

Long time no post, but I'm bored so I'll share some stories.

When I was a kid, my mom called the local Mr. Parts to get a new water pump for my dad to put on when he got home. They quoted her a price and she thought it was high, so she had my grandfather call. They quoted him a price less than half what she was quoted. Same exact part, same store, same salesperson even, but totally jacked up price because she was a woman.

Techs and salespeople really need to stop playing games with people, trust is key to customers returning. I took my car to the local Goodyear a few years back for an inspection. They told me I needed to have my throttle body cleaned because there was carbon buildup and that my power steering fluid was dirty.

Well, I wasn't too pleased that they were disassembling my engine and peeking at the throttle body without my consent as this isn't part of the state inspection procedure and I told them that. The fluid was fine as I checked it before I took the car in. They wanted $80 for some stupid procedure to remove this nonexistant buildup to which I declined.

I checked the throttle body when I got home, it was as clean as when the car was new.

I've yet to find a local shop I can really trust with my car. They all want to poke around in places I don't want them and make stuff up.

Now my dad has a Hyundai Accent ugly thing. His kept throwing up cylinder misfire codes so he took it to the local dealer. He didn't buy the car there and wasn't even under warranty, but they looked at it and replaced the crankshaft sensor all for free. They didn't do anything he didn't ask for. That is what builds trust and he is going there for his next car.