The idea that Blizzard bans by IP never made any sense to me, I'm not sure how that whole rumor got started. First off it would be a bad idea for a business to do that because individual's IPs can change. What I mean is usually ISP's charge to give you a static IP (and you don't want that anyway). Yours more than likely is allocated through DHCP. While it doesn't change often it *can* change, meaning I could be a new player and just signed up through my ISP and already be banned/blacklisted, because the last guy that had my IP was a botter. Blizzard just won't do that. Second reason it's a bad idea is they have no idea who the IP belongs do. They aren't law enforcement that can ask a judge to get the ISP to release their records. For all they know those 10 people on one IP are through a college dorm. The most they can do is an IP lookup and see that it belongs to a specific ISP, and that it's coming from your city. Blizzard isn't all big brother the way most people think they are. Sure they have ways of catching you, but through your IP address isn't one of them.
To answer your question yes I run more than one bot from the same IP address.
**Edit**
To clarify I am sure they have the ability to look at the IP address, and if they have a GM reviewing your case manually I am sure it's taken into account, but it isn't what the red flag would be. Say you have 10 bots going 24/7, all from the same IP address. That looks suspicious by Blizzard's standards, so they all get banned, because even if it were a college dorm all 10 going 24/7 is clearly botting. Now say you have the same 10 bots going 8-14 hours a day, at random times, through the same IP. That could be a college dorm, so Blizzard doesn't ban. Now was it the IP address at fault, or the activity of the bots at fault?