Why, Iain's? No Leaver I knew thought the EU was perfect. It is why Corbyn famously said 7 out of 10 and upset those who felt only 100% support could be given. I, and others I know, found the way Greece was treated such that it was the nearest we came to voting Leave.

But again, your focus is on economics. You really do need to give some more thoight to the politics of the norder with Ireland. It is not going too far, I think, to say it is the real crunch question, not the "exit bill".