Selling invites is allowed, but there are some restrictions in order to prevent people from selling accounts and invites obtained through hacking. In order to sell invites or accounts to invite-only sites, you must:
selling invites doesn't make a difference.
It seems like the admin here is finding new and creative ways to rationalize existing behavior and transactions without changing much of anything other than banning the low hanging fruit that dare to be bold enough to admit to their procurement and acquisition methods.
Nothing has really changed. As long as the seller admits nothing publicly it's business as usual and the rules that Theymos has drafted clearly reflect that.