AFAIK EU wants closed borders and a different financial center if UK leaves EU. Both of these can have the effect of hurting the UK economy.
Brexit is the UK imposing sanctions on itself. You can watch the GBP tick up or down according to how likely it looks to actually happen on any given day based on stupid statements by the PM.
Without outside money Switzerland would be in a much worse situation.
What? That is exactly the opposite of reality.
Its the UK that want hard Brexit.