3.2 billion of revenue in one quarter [1] is is nothing to scoff at. However the more important point is without the profit from AWS, Amazon would still be posting huge deficits [2] and would probably face much higher shareholder pressure to produce.
[1] http://venturebeat.com/2016/10/27/aws-reports-3-2-billion-in...
[2] http://www.geekwire.com/2016/amazon-without-aws-online-retai...