Blizzard's more against that kind of thing as a "buyer beware" kind of thing. Its very easy to get scammed in situations like that, and you end up having no recourse since you weren't supposed to be doing that anyways.
If you haven't been 'punished', you won't be... unless someone wants one of those accounts back.
Just stop theses activities and don't ever tell them, if they did not spotted you until now, it might be okay.
Your offence wasn't a very big one though, so I wouldn't beat myself up over it.
EU first PG wave 30, come at me bros.