I'm still considering getting a membership with our area bikeshare, but there are some scenarios like that big festival where you're in danger of getting dock-blocked - the bike share is so popular here, everyone else and their grandparents will also have used bike share bikes and taken up all the docks. There's also the opposite problem of no bikes being available at the bike share station, again due to the popularity.

For those scenarios, I'd be fine with riding my own bike to said event and locking it up as best I could. Sure, something might happen despite my best precautions, but if the folks in my area are saying that dock-block is a greater risk than possible bike theft, I'll trust their experience.