I know for a fact that this stuff happens in IT - before I taught myself how to fix/upgrade hardware I had computers come back from the shop with with different (cheaper) parts in them than they went in with, and I saw it happen first hand when I was behind the counter. I expect IT support and mechanics workshops have a similar atmoshpere - you have customers who come in with things that they don't know anything about and they ask you to fix them. You're in a position of power because you have expertise that they don't have, and it's extremely easy to take advantage of that for your own benefit or at least to make things easy on yourself.
With cars and computers and any other esoteric knowledge I think you really need to find somebody you trust to work on them and not mess you around. Or you need to show them that you know at least marginally what you're talking about so that they know they can't pull the wool over your eyes.
So in short - it wouldn't surprise me at all.
With cars and computers and any other esoteric knowledge I think you really need to find somebody you trust to work on them and not mess you around. Or you need to show them that you know at least marginally what you're talking about so that they know they can't pull the wool over your eyes.
So in short - it wouldn't surprise me at all.