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?
aside from a lot of confoobly features and fancy internal speakers, the ability to set advanced color grading, and high-end built-in streaming features, etc., it mostly comes down to the manufacturing quality of the display and its heat resistance/dissipation. the better this is, the longer the LEDs will last and the longer your display element will last. cheap tv displays dissipate heat poorly, so the longer they’re left on at a time, the shorter their lifespan. cheap TVs may only last 2-5 years with heavy use.
aside from that, the color depth and brightness of the display can contribute to its cost, as well as the quality of the other parts.