Without testing it, I would say they would take less bandwidth than the client, but more than say another NPC in a zone. Looking at the packets collected, you have all of the initial zone in stuff for the zone itself, player profile, AAs, inventory, mob zone entry, etc that takes up say ~1/3 of the total packets used in a typical hour long xp run. Bots would updating the client as to HPs, location, etc., but wouldn't require all of the other client specific updates that are sent for all of the other mobs in a zone. I'll try to do a test this week, since I sometimes run full Bot raids, and it would be interesting to see how that compares to what I got running with just a Merc or solo.
A made up estimate off the top of my head would be that bots use 1/4 or less of the bandwidth after the initial zone-in stuff, with almost none of the zone-in traffic that clients get. I would say they hit the CPU much harder than bandwidth.
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