They can only game the system because RCs are used to create accounts. The trick is to separate the incentives of investors and content curation. Burning STEEM to create accounts is an effective method for doing it, but is problematic for on-boarding. The bio hash concept is fairly good, but Minds.com uses a phone number. The phone number idea is my favorite, because you can identify the burner numbers, requiring the individual to actually use their rule phone number. Its not perfect, but it is helpful.
Alternatively, what if we beefed up the reputation system? We could make a person's vote value be based on the account's reputation level. Right now reputations are worthless digits next to a name, but the old Silkroad black market taught a valuable lesson: if the reputation system is crucial people behave themselves.
I think creating a better reputation system could be a worthwhile endeavor. But I'm afraid that, too, would be gameable using off-chain money transfers to buy into a higher reputation if it depended on endorsements. On the other hand, that would, after all, put money into the pockets of the little guy.