I think the SOMETIMES people like Snape so much is because they see themselves... right? maybe? Not everyone has had a happy childhood, and some have been picked on by bullies. Some have always watched the popular group from a distance, and have dreamed to be somebody they weren't....any of this sound familiar?
Course, I think he's cool 'cuz he's so wicked!
If that makes any sense.
And I think he'd be boring if he did quit, ya know?