Why I might vote 'out' in the referendum

Here's the thing. I have done my best to assess the actual information, rather than scaremongering, from both sides and at the moment, neither has swayed me. Here's my logic for therefore voting out:

My vote won't decide what happens. *If I vote 'in' I seem to be saying 'things are fine with the EU,' but they aren'tIf I vote 'out', then I'm adding weight to the argument the government needs to do more to distance us from the less palatable aspects of the EU. The usual objection to this kind of voting to make a point is 'But if everyone voted like that, we would be in a mess.'
I'm sure I don't need to point out to you the logical error in that argument. But just in case I do, we are talking about unconnected events. The way I vote will not have any influence on how other people behave. The 'What if everyone...' argument has no merit because my action is independent. 
* OK, strictly speaking, it could be totally balanced with my vote being the decider, but that is ridiculously unlikely.