Yeah, that is definitely one of the main problems we face. A few things that mitigate this, however:

1. If you have friends who use Thought Ocean, they can be the first people that you vouch for.

2. If you see a particularly interesting post or insightful comment, vouching for the person who posted it is likely a good idea.

3. Thought Ocean has a feature that gives you feedback on why things get ranked the way they do (the "flow comes through.." feature on the flow tab). This makes a trial-and-error approach possible: just vouch for random people, keep the people who contribute to good posts and lose the people who contribute to bad ones.