If it comes down to camping on a non-designated site or risking injury/death traveling in the dark or high winds, I'd risk the fine and stay where I needed too.

db, set a good example. Leave little or no trace and don't let it bother you.

I wouldn't be building a big fire or partying on a non-designated site, but the rangers know it happens, and I imagine they deal with it on a case by case basis ;)