system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : In the age of HDTV and DSLR Cameras, Why are CCTV footages like 1980's TV resolution?

Even when storage is so cheap today!
gpt
A CCTV system can consist of hundreds of cameras and video could be retained for 30± days, in some cases even years. Hundreds of tb's of storage may be required, your cost to store can easily double or triple as you  jump from SD to HD and double from HD to 1080p. Frame rate and resolution is totally relevant to cost.