Well the general feeling people have about the US servers is they are more active in handing out bans.
No one really knows why exactly as it could be down to area management, resources, player base, banning methods etc.
People do get banned on EU so that does happen. Just you don't really see much of it, most people get banned because of greed and don't follow good bot practice...
Just do it smart and follow the golden rules;
- don't bot 24/7
- talk now and again
- do more than one levelling method
- don't grind for hours on end without a break