YES, youtube bans IP addresses! Use a different IP when creating each account. Also use a different email each time. If you are going to buy an account creator, might as well get a booster that does comments, ratings, favs, subs, everything in one. TubeBooster is A+ and has basically the same account creator as Tube Automator, only tube automator sucks and only does ratings and comments.
YT also can ban your url you use in the description, and can ban videos. They have a very smart system that can detect videos. So if you keep getting banned over and over, change your url or use a redirect, and use all new videos.