I KNOW for a fact that your drop rate changes once you log out. I can be at steel dragons for 6 hours straight.... get the same stuff.. then log out n in and get totally different drops. And to be honest... I really think jagex made it so if you have black marks against your account, that effects ur drop rate. might not be true, but i believe it is. Edit: Also, How many people are on each server Do determine rare drops... But now a days theres 1,000+ on every server.. so it wouldnt even effect it at all to be on one server or another.