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).