It'd be kind of interesting to know how many of the 'in' people remember a time before the EU? It was actually ok, not perfect, but nothing ever is....I don't recall seeing the kind of hardships and uncertainties for the future that are happening now in our society.
I do get that it's a scary prospect to vote for something you've never had experience of though (not being part of the EU) ...but it really wouldn't be the UK Armageddon that Cameron's portraying in order to scare the shit out of everyone.