Fantastic reductio ad absurdum - that's nearly a quarter of UK GDP or roughly 45x UK's net contribution to the EU in 2016. Remind me what the total EU budget is?
Anyone can construct imaginary strawmen - let's stick to scenarios that have some realistic chance of taking place.
The UK has already given some sense of what a bad deal would look like via its red lines -a deal that doesn't completely end freedom of movement, jurisdiction of the ECJ among other things.
Are compromises on these issues worse than the consequences of no deal? For Brexit jihadists, they are -and that's why many believe significant damage to the economy and livelihoods is a price worth paying.