Banning T3s will stop them from sending you results. But for those of us who have broadband, we need people who have a high upload bandwidth in order to achieve max dld speed. Connecting to more people uses up bandwidth (albeit, not very much). If you connect to 6 Cable hosts, you will probably get the same speed as if you connected to one T3 user, so I still think that it's up to the user to be more careful: watch out for fishy titles, use the preview function, etc, etc...
It's not so much about feeling sorry for them.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-