Yeah, i think i leveled around 20 or more characters to level 90 on my main account in the past 2 years, never had a warning/ban. Just make sure you supervise it, preferably every 15 minutes or so, just to make sure its not stuck somewhere or when its doing nothing (sometimes you have to turn the bot off and on again to continue with next quests). I am using Kicks leveling profiles, He really did an awesome job. (which reminds me, I should personally thank you him some way sometime soon!)
just curious, how many times have you sold gold and not lost all accounts on the IP, and how many times did you sell gold and lose every account on the IP? and when you say 'ban the IP' do you mean you can no longer play from that IP, or just ban all accounts running currently on the same IP.