There exist hundreds of thousands of businesses in the UK that don't need a political or economic link between the EU and the UK to prosper.Do you have any proof that they are a net economic drain on the economy? All those thousands of unemployed are certainly going to be a real tax benefit.
If there are businesses such as the car industry that requires such links, then too bad. I cannot see how it is fair for my taxes to be paid to the EU so that the UK car industry can exist. In essence they are being subsidised at my and other taxpayers' expense.