The problem is not with the name or # ID.
The problem is that some people have several ID's and
when they get banned they create some more.
They are usually people who have strong opinions and like the Debate Forums and start attacking the messenger instead
of the message.
It is obvious they follow certain posters they don't like.
Besides regular spammers there are also respected posters
who have more than 1 ID and they also often use them in debates or when they want to hide. It is not against TOS
as long as you don't use several ID's in the same thread.