You are right chuck, according to this chart: https://en.wikipedia.org/wiki/Budget_of_the_European_Union#EU-27_contributions_.282007-2013.29
Germany is the first contributor with 19,90% of share of total EU contributions (well that is accurate to Germany's size).
Second is France with 17,76%
Third is Italy with 13,57%
Fourth is finally the UK with only 10,70% almost paying as much as Spain, whereas economically speaking the UK should pay as much as France.
Frankly, the UK has already many preferential treatments, and I think this goes back from Thatcher.
During that time there was a huge argument between Thatcher and the PM of France of that time Jacques Chirac that replied:
"Mais qu'est-ce qu'elle me veut de plus, cette ménagère ? Mes couilles sur un plateau ? "
which English roughly would mean:
"But what does this old fart want again, my balls on a silver platter?"
x) Ah I miss Mr Chirac... He was one of the few French presidents that had actual balls (he is also the one that refused to help the 'Muricans invading Afghanistan and Irak), and kept France out of this NATO shit.
So to sum up, the UK (or more accurately ENGLAND) could leave, because we would not lose that much, since they are actually currently more benefitting from the European system with many preferential treatments than the contrary, with England out, then I believe Europe could have more advantages than drawbacks from their leave without a doubt.
Edited 5/23/2016 09:26:16