It has recently come to light the number of people that are using multiple accounts to give themselves an unfair advantage over other users, generally, this is using more than one account to give you more than your fair share of votes (which is just 1).

The phenomenon is very recent and was unnoticeably small until about a month ago.
As of posting, 15 users have been banned with a total of more than 200 accounts, including many high profile and active members such as @frankomisko, @Dooose and @DAVPPK

This is a warning to anyone that is thinking of creating multiple accounts, it is unacceptable and will be dealt with.