With larger nations, there's also the cost of searching for the fugitive and also of dealing with the foreign nation itself (vis a vis police, military, etc).

With larger nations, there's also the cost of searching for the fugitive and also of dealing with the foreign nation itself (vis a vis police, military, etc). It's more than the cost of getting there. Sealand can be "conquered" on a whim. It exists solely at the pleasure of the UK.