Gaming

I wouldn't call €1300 (cheapest 8K TV where I'm living) outrageously expensive. You can easily spend this much on a 4K TV without straying into true high-end territory.

I remember when the first "mass market" flat screen TVs came about around in the late '90s. The earliest one I saw with my own eyes was still years away from HD, hardly even flat by modern standards (I think it was a plasma TV), but cost a cool 20 grand. The store had it behind a small fence so that people wouldn't accidentally damage it. I was not impressed by the image quality and it was actually smaller than the largest CRT TVs I had seen. Maybe 30" at best.

Either way, even with a handful of games now supporting real or upscaled 8K, the issue of a lack of content remains. Streaming services rarely support it beyond the odd demo video on YouTube and even if they did, they are hardly what you go for if you want good image quality, given how mercilessly they compress their content to save on bandwidth costs. There's no 8K Blu-Ray yet and there might not ever be one. By the time there is a decent amount of 8K content available, the current lineup of 8K TVs will be hopelessly outdated and likely not even support future standards.

Really the most useful application for these I can think of right now is showing photos in all of their glory to bored relatives and friends. 8K is slightly more than 33 megapixels, after all, whereas 4K is just over 8 megapixels. Landscape photography in particular benefits a lot from being seen at higher resolutions.