I'm not a Brexiter. But I think, on balance, we'd be better off out. No one knows what will happen if we leave. But no one knows what will happen if we stay. I see a huge implosion of the EU. Too many very different countries, with very different, wants, needs and itineries. It would be better to extricate ourselves now on our terms, than from a complicated acrimonious mess.
If we leave, I see a rocky 2 or 3 years economically until we find our feet and the divorce is finalised. If we stay, we won't have a rocky 2 or 3 years economically. Well, that's if the worldwide recession which is certain doesn't arrive in that time. But 10/20 years down the line we'll be overcrowded (900,000 new national insurance registrations David Cameron? No, something like 2,200,000 it has been revealed over last few years)
When we joined the EU it was with 6 other strong economically prosperous countries. Now there are 20+ something not so prosperous countries, with 4 or 5 much poorer countries queuing up to join, all heading for the richer countries like the UK. Something like 56 million Turkish people for example, (incidentally bordered with Syria), who will automatically have the right to come to the UK, no questions asked.
We need to control our borders imo, or the natural mass immigration from the EU will cause untold problems in a decade or so. As an aside, it also means we would have to limit our immigration further as well, from other countries if it's so EU biased.
That's my viewpoint, such as it is, anyway. The figures are possibly not accurate, but I think they're the general ballpark.