Erm...unfortunately, with the recent worm outbreaks,
that's exactly opposite.
The unfiltered users are the ones causing the most pain
and suffering in terms of increased load on the network;
if you're looking to recoup the costs of having to upgrade
infrastructure to support additional worm traffic, you
need to be charging *more* for unfiltered access than you
charge for filtered access.
So, tell me--are you willing to pay a premium for
unfiltered access to the Internet? 
Matt
happily paying a premium for non-NAT'd, unfiltered
access to the Internet.
