That is indeed a sword that cuts both ways.  The experts have the interest but interest itself does not necessitate expertise. 

To address this:  DAO jurors can subscribe to the type of knowledge that they have an interest in validating.  As an example, if I have a special aptitude for Logic, I can enroll to be in DAO juries that adjudicate Logic questions.   I stake a small amount to do so, but I earn a small profit if my vote matches the ultimate DAO decision.

In this way, those that have the expertise and interest over time have better scores, thus more weight in the vote.  Those who have the interest, but not the expertise, lose their small stake and earn nothing but even this helps to finance the final result of validation. 

Does something like that address your concern?

M

Knowledgecoin.io