So each socio-economic group is largely going to vote for it's own interest apart from a few people either side on political beleifs such as "it's better to be a european citizen" or "we just want to be an independant country" and the referendum largely comes down to "which group is larger".
I agree, but think you have been rather unfair on the remain group in your assessment.
While my own choice for remain is mostly selfish, there is also an element of thinking of the greater good. This some of the points you raise on the leave side are applicable, many of them would very well continue after a leave vote. I seriously doubt house prices will fall significantly, unless an out vote causes a recession. If it does, wages will not rise at the bottom, and will probably fall. If it doesn't, wages will *still* probably not rise.
IMHO the potential for harm across the entire population does not balance the potential benefits, especially with the economy (UK and global) still being so fragile. But that's just my opinion, anyone is perfectly entitle to disagree with me :)