sharing accounts vs. selling accounts

I know you are not allowed to sell accounts. However, there is one person who wants to share accounts. I have a suspicion that he might retire after that. Is that allowed?

Is it really violation to sell & buy Envato accounts? I am curious about it.

It is indeed. See the ninth clause https://videohive.net/legal/market#membership

Yes - potentially support might be able to make special circumstances but as it stands usually you cannot transfer or sell ownership