Somewhat tangential, but Facebook’s average revenue per user was less than $9 in 2019. I can’t imagine TV manufacturers can eek out nearly that much revenue from the data they collect. Especially considering that almost everyone is streaming or using cable and all of that data is going to Hulu/Netflix/Cable providers and then passed on to advertisers anyway.
In the case of Samsung and smart TVs, and to fully support the argument you are supporting, it is not sufficient that Samsung makes a lot of money. They need to make a lot more per user selling data than they would adding $20 to the price of that TV.
But that $20 price difference would probably mean that less people buy Samsung, so the maths isn't going to be that straightforward.