I got a gopro knock-off for Christmas, I can't figure out what I would ever use it for. I guess I could mount it on my commuter handlebars, and record every commute just in case, but that would mean I'd have to erase the SD card all the time (there's no way I'd want to save up all that video or post it or watch it) and recharge the thing, and I just can't be bothered.
I could see maybe recording a fun trail ride, but even then, the hassle of setting up the mount makes the idea not worth it to me.