"What people may not know is a lot if not all buy here pay here dealers place GPS devices on every car sold."
https://ficoforums.myfico.com/t5/Auto-Loans/Buy-Here-Pay-Here-Loans-told-by-a-REPO-MAN-You-Should-Read-This/td-p/4365694
Seems like a minor concern to me. Admittedly, this is the first I am hearing of it.
If placing and removal is so prolific, I have little reason to worry.
There are privacy, ethical, technical, and financial concerns. I don't think it's really that minor. The installation of these sorts of systems is only prolific at Buy Here Pay Here type places. I can't understand why someone would deliberately shop at one of those unless they have no other choice. You can find cheaper better cars elsewhere and then you don't have to worry about them defrauding you every step of the way.
I agree, the main reason would be desperation. If there is 1 place that will lend you the money, guess where you will go? The number of people in that financial situation that lurk on this site probably rounds to about 0. And if they are here, they will not be in that position very long if they can begin to implement the strategies learned here.
From what I have read, once they no longer have an interest in a vehicle, they are committing a crime if they continue to use these devices. I would guess this rarely, if ever, happens. They do not want to commit crime, they want to make money. Once the car is sold and paid for, you do not exist to them. These criminal charges would be public information, regardless of a conviction. Do you have any evidence of even 1 case where one of these businesses used these devices while not having a controlling interest in a vehicle?