- True hard-core Brexiteers really do care about sovereignty. They are nationalists.They want nobody but themselves to have any element of control. If that means the destruction of the economy, they are fine with that, like nationalists everywhere.
- The Conservative party has been interested in the idea of the UK as Singapore-upon-Thames. Partly this is about reducing the role of the state (and thus taxes, one might think) and partly about re-introducing a vibrant manufacturing economy. Many of the people who punted this idea are also Brexiteers. Being a member of the EU was a barrier to establishing a low-wage economy that can compete with the East. They view the EU as outdated because it's a rule-based organisation. There are rules on social standards, product safety, animal health and a huge array of other matters. These people will tolerate temporary economic setbacks (ten years?) in the pursuit of jam in the future.
- Opportunists. People who are motivated by power, and will be wherever there's the opportunity to be in control. They will sacrifice anybody else in its pursuit.