if you weight it based on number of votes bots become an issue if you weight it based on steem power whales can circle jerk. if you weight it based on both whales with bots can circle jerk. the system will never be 100% perfect but what helps is educating the masses and having more users with over 9 dollars in their account. millions of real legitimate users of steemit is what can insure it against any bad actors in the end