This problem has been discussed many times, most notably by Hive account@anyx. I'm not sure what the solution is, other than not caring about vote count when curators make their decision about giving a vote. Sybil attacks are difficult to stop, but unless someone invests a lot of money into the bots to make their votes actually worth something, the $ amount doesn't change. Vote count alone, IMO, doesn't mean much, other than someone who is gaming the system and not worth my attention in the future.