It would also be a good idea to limit memberships to only 1 per person.
This is a non-trivial problem.
Many users have access to hundreds of machines with unique ips and have the scripting resources to automate nearly undetectable sock-puppets.
The one thing they can't fake is steem. So, under the current system, they can't amplify their vote with multiple accounts (well, except for the free steem delegation and (25) rep that each new account automatically gets, which is sort of a problem of its own).
Some people have access to hundreds of computers with unique ips and unique hard-drive serial numbers.
Yes, you can reduce the number of accounts operating from one computer (hypothetically anyway), but that's not what I'm talking about.
I'm pretty sure they're not using their massive army of zombie machines EXCLUSIVELY for steem farming. They could probably do any number of things simultaneously while maintaining reasonable efficiency.
Marky is exactly like TRUMP, you can't get rid of him and he's not accountable to anyone.
And even if you did get rid of him, it would just move the next guy up a spot and they'd do the exact same things.