Exactly. Brexit long term net effect could be a few points off their GDP. That's not the end of the world, but it's certainly significant and it will make British people a poorer, which of course has an impact on public services. Whether this is worth it's up to British people to assess.
My personal suspiction is that UK citizens were mislead about the consequences of leaving but, hey, democracy is about taking decisions with incomplete information. People have spoken and their decision is sacred. I wish the UK the best luck and it's with sadness that I believe they will need a lot of it.
If your definition of Democracy requires no deception or falsehood in politics then there likely has never been a Democracy in human history. The voters never work with perfect knowledge, and the politicians always lie.
My personal suspiction is that UK citizens were mislead about the consequences of leaving but, hey, democracy is about taking decisions with incomplete information. People have spoken and their decision is sacred. I wish the UK the best luck and it's with sadness that I believe they will need a lot of it.