After the thatcher rabate and the eu subsidies GB pays around 18 million pounds per day to the eu.
If we divide that through the 50 millions brits it makes ~0,36 pounds per day or 131,4 pounds per year for every brit and this would place GB on place 8 of the 10 net contributors.
What a high price for a domestic market of ~340 million people and freedom of travel, living and working where you want.
The funny thing:
Of course GB can get out, but they would have to negotiate all treaties again and as net effect they would have a status like the scadinavian countries:
They are part of the EU just without power to say anything.
we pay 55 million per day to the criminal mafia eu, they give us back 27.5 million per day meaning they rob us of 27.5 million per day, where you getting your numbers from??
mark my words, WE ARE LEAVING BY VOTE ON THE 23rd OR BULLETS ON THE 24th

The numbers are from 2014, but i just found the numbers for 2015 from your treasury:
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/483344/EU_finances_2015_final_web_09122015.pdf#page=18its about ~23,3 million a day now -> 0,46 pound per day or 170 pound per year per brit.
(oh and btw. even if the 55 would be right - GB does not sent it: the thatcher rabate is calculated at source - there is no payback from the eu, GB just sends less or rather the other EU states pays for GB)
/edit
this is not all actually, there is even more money for GB in the form of direct subsidies for research and etc for the private sector which accumulates to more the 1 billion pound. (2013 was 1,4 billion pound)
i dont care what fabrications they publish, what they told us a few year ago is they supposedly negotiated us into paying something like 908 billion by 2020, thats not negotiation, and im english i do not agree to pay them a penny i am my own government and i have no treaties contracts or agreements with them, they are deceiving you all and playing with your desires and you dont even know it, this is what they do, here is $1000 ive just typed it up and its real, you can use it as money if you like, but if you do use it as money you have to pay me back $1100 of real money to cancel the debt, they are taking the planet over piece by piece and enslaving you all with debt and the desire to work when there are no jobs so silly jobs are created to keep up the circle of the workers funding the bankers :/