I'm in but based on nothing more than 'better the devil you know' and possibly because I work in France so my situation may well change.
The problem for me is that no one can actually say what would happen if we left. My hope is that this campaign will lead to the government's of Europe realise that the current situation demands that there is a major overhaul of what is generally a very good idea that has become a bloated and self serving bureaucracy.