You can't limit what people want, but you can make them choose other avenues of getting it.
If you charge for transit on news server connections, people will naturally gravitate towards using it for lower size messages, which means they will go to unmetered connections for large downloads. Then not including alt.binaries in our server is less likely to have people looking for and utilizing methods to still get binaries through your service in different ways.
Theres huge differences in outcome based on how you attempt to limit demand. None are perfect, but just opting out of carrying binaries is the equivalent of the drug war, where they make the materials and transfer of them illegal. I'm not even sure how to stretch the metaphor to what I'm talking about, because the national policy on drugs and the drug war seems like a very poor fit.
A good metaphor might be the postal system. The old news system was like if the post office didn't charge per message or weight, just a flat monthly fee. Removing alt.binaries is like the post office then said they don't want you shopping g anything over 50 lbs because it's clogging all the delivery vehicles shipping large things. What I'm proposing is them giving you a total cumulative weight allotment per month you can't go over (or you get charges a lot). Demand will obviously respond to that, and people will opt for other methods to ship heavy things.
