Bear in mind that if all you're doing is watching "broadcast" TV content, the content itself is tremendously compressed and the value above 1080 HD is a lot smaller than you'd think.
Whether it's cable, satellite, IPTV, or streaming, the incentive is to reduce the bandwidth for each individual channel/stream as much as possible. So even though different sources may both be compressed with MPEG-4 (most HD), or with HEVC (most UHD), those compression algorithms can be tuned to specific bit rates. A movie coming of a DVD or Blu-Ray will be tuned to the highest possible bit rate, so it will contain much more information than that same movie being sent to you in the same resolution via your TV provider, and consequently look better.
So unless you're regularly watching movies, and by "movies" I mean very high quality physical media that is encoded at high bit rate, it's very easy to overpay for a TV. Because most of what comes to you over a wire will be heavily compressed at a much lower bit rate than the TV is capable of displaying.
Most people's eyes are pretty well maxed out at 4K as well, so I don't even know why the industry seems to be talking about 8K coming next.
