AFAIK the resale of software regardless of EULA restrictions has been declared legal in some European countries. They're not necessarily legit in the US, but we're not everywhere.

Also even in the US, if you're a home user there's no real concern. I wouldn't run a business on resold keys but I'd certainly use them for home if I needed one.

That' not true. Reselling volume licenses is perfectly legal in the EU.

are you the seller or how do you know? (serious question)