Fine, you're not, maybe its because you probably know what fuel injection or a differential is. If you know a lot about cars, repairs, etc, then sure, it's easy to spot when your being ripped off. The vast majority don't and do get ripped off.
You are probably right - yes, I know sth about cars and what I don`t know of can always be explained to me by a certain befriended mechanic.
But I would never sell a "made up" car - it would be totally beyond/against my nature.
And I don`t believe that I am the only person like that in Poland. There must be more of us.
That is why I told you to cut down on generalising. If you felt offended, I am sorry, but you should also take my feelings into account.