Economies of scale and some sort of insufficient-competition market failure seem to sometimes make relatively-niche choices far more expensive than they "should" be, and TVs seem to be one of those cases—so you end up with manufacturers making $100 extra dollars (numbers made up, but bear with me) per panel on ads, but it'd cost you $1,000 to get the same panel without ads, which distorts apparent consumer preferences (pushing that niche even farther out of the mainstream, and so making the gap even worse).
Genuine question, is it even an option to pay $X more and get an otherwise identical TV with no overlay ads? It's admittedly been 7 or 8 years since I last purchased a TV, but I don't remember such an option being available at the time, and the only time I can ever remember seeing that sort of choice being available was with the kindle, where it's very explicit that the ad-free (but otherwise identical) version is like $20 more (or, was when I bought my kindle, which again was many years ago).
That being said, I'd be extremely curious to see sales numbers for ad-free vs ad-laden kindles, although I sort of doubt I'll ever have the chance to.