How about the option undecided or don't know?
Reason being the vast majority of the us do not know the full implications of leaving, and I include myself in this. For instance yes it may cost us £55 million a day, but what do we receive in subsidies etc?
The implications for business when trading with Europe? Just think any purchases Internet or otherwise will attract VAT as the cross our borders.
Also, an out result will give the SNP the perfect opportunity to call yet another referendum on the question of Scottish Independence, and I say this as a Scot!
Regards,
HL