Okay, then how about this: By being part of the EU, a country will be spending part of a massive and bureaucratic organization that has failed financial audits

Okay, then how about this: By being part of the EU, a country will be spending part of a massive and bureaucratic organization that has failed financial audits for 2 decades (a measurable argument) and basically gives you less and less control over your own actions as a nation. If you happen to be less keen on immigration, then the EU is also a bad place as the enforcement is pretty weak. I think those are pretty reasonable arguments that come down to one thing: autonomy for nation states.