I built a show tracker just for me (it's not nearly where I want it to be, so I don't share it anywhere, eg. currently my show database is out of date I need to see what broke my cron tonight. no ssl cert, no optimization at all I don't even know if my js is minified tbh, etc).
I am the only active user http://www.overseer.tv/user/smt and I built this because I watch a shit ton of shows and I often forget when premieres come, or what episode I left off on. My site is basically one click to mark a show/season/episode "watched" and I have a calendar and upcoming section, which is all I wanted from many other sites I tried before creating my own.
I host this on an EC2 instance for 29$ a month, and my own usage alone makes it worth it to me haha.