You are missing out! Lately you have had 1000 people that can sell votes for $0.01 (like me). You need to incentivize people that can sell votes at higher levels.
My recommendation is to build a structure that pays a higher percentage for people selling votes at higher levels. I don't have a complete grasp on the economics of Minnowbooster, but I do know that when you have 1000 people that will sell a vote at $0.01 level and none that will sell at $0.1 or $1.0, you're missing something.
How about looking at a tiered system that rewards people that can sell at higher levels more the thousand of us that can't?
Hmmm thats interesting I'm forwarding it to the devs and lets see what happens :)