There may be a custom avatars as files hack avalible that will allow you to store them as files as oposed to in the DB, but I'm not 100% sure.
How are you getting the userid for the user's avatar you want to display?
One of the reasons I'd say for having them in the DB is so that if you move host, or when you back up your DB you have everything. Plus its easier to prevent hotlinking but adding a bit of PHP to the avatar.php and attachment.php which is harder and not allways avalible if they are stored as files.
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