Re: Account Sharing
Count on it that it warrants a permanent bann.
I'm sure most of us are familiar with boosting service for real-money trades.
Game studio's are not happy about people having achievements (or badges in this case) that they did not actually earn, and getting bad press of stories about getting scammed, and account theft that flow forth from account sharing activities.
Rekfull was permanently banned from World of Warcraft for boosting/account sharing, and deleted his highly accomplished account.
So, I would strongly advise against account sharing, an account being played on different hardware, under a different IP, suddenly getting the 20kill badge. And 4K damage badge out of nowhere could flag an account for review.
Better safe than sorry.