I feel like it used to be size, color, and clarity meant more expensive. Now I look at a 500$ 4k TV and a 2000$ 4k TV and I don’t know what the difference is. They can both be smart TVs, be the same size, and have a lot of same advertised features, but what are the subtle unspoken mysteries that justify a huge price gap?
Some TV’s are OLED (Organic Light Emitting Diode). These tend to be more expensive, as manufacturers argue the technology has better black levels and contrast ratios (the range of brightness between the blackest black and whitest white the TV can produce). Personally, I don’t see that big of a difference between OLED and non-OLED. At least, not enough to justify spending $2000 on a TV. Hope this helps.