Not only the avatars but usernames as well. You don't necessarily have to use your own name, you can use a pen name, your business name or a nickname but make it catchy and memorable. You really should be trying to brand yourself from the word go.
This is not your average forum. You're here because you're either an internet marketer or you want to be one. If you're going to be one then one day you're going to be selling something (product/service) and you will want to be recognised when you do.
Recognised in the best way possible that is.