incrediBILL - 2:38 am on Apr 21, 2010 (gmt 0)
I think the point is to get the cash.
Can you imagine billing people for 7 years of past unpaid taxes on Amazon goods and services?
Many millions of dollars just waiting to be collected.
Not only that, it probably comes with penalties for not being paid in a timely manner and interest but I'd assume the first volley of collection letters would waive the penalties if they paid in a timely manner as a "goodwill" gesture to the public.