Thanks to a tweet from @andreasnrb, it was brought to my attention that transferring Envato (like ThemeForest, CodeCanyon, etc.) accounts is not allowed.
For background, see section 9 of the Envato Market Terms:
Your responsibility: You promise that information you give us is true, accurate and complete and that you will keep your account information up-to-date (including a current email address). Your membership is not transferrable. You are responsible for any use of the Envato Market sites that occurs in conjunction with your username and password so keep your password secure and don’t let any other person use your username or password. If you realise there’s any unauthorized use of your password or any breach of security you need to let us know immediately.
Apparently, themes can be transferred to another account, but any account history (sales numbers, "Elite" status, badges, etc.) cannot.
While I don't quite understand the reasoning behind the rule, I don't want WP Chat to facilitate the breaking of that rule, so, I'm formally disallowing any WP Chat threads advertising the sales of Envato accounts.
As with any transaction, do your due diligence.