I am permitted to sell my camera to a UK national in the UK. I would transfer ownership to the buyer. This act removes me from the responsibility of not shipping the unit outside the UK without appropriate paperwork and authority. My ownership is legal. If a future owner decides to break the rules, it is they who will have to answer for their actions and not me. I am not selling weapons that require a licence to own so selling is not an issue provided I obey the rules.
Buying on eBay is a very mixed bag. Many US based eBay sellers will not ship anything relating to thermal cameras outside the USA. That frustratingly includes lenses accessories etc. SPi make this very clear on their auction pages. EBay now warns bidders of the ITAR regulations on many thermal camera auctions. When you try to bid, you get a warning about controlled technology that you have to acknowledge.
Some eBay sellers care not a jot about ITAR and others even try to claim that a Thermal Camera is not covered by ITAR by quoting the regulations for simple night vision sights ! Daft blighters
If someone decides to ship a high resolution, high frame rate thermal camera across borders, they are committing the breach of regulations and not the recipient. The sender take responsibility for what they ship.
It is a fact that many ITAR and Dual Use Technology auctions take place on eBay and I have not seen any taken down due to complaints from the US BIS. Many of the sellers will ship overseas without any thought about regulations.