[jstummbillig]

Interesting. How do you incentivise the opinion givers to actually consider the options instead of just efficiently (randomly) selecting an answer?

[dotancohen]

How about a reward for choosing the "correct" answer.

If the side with the most votes is the side you chose, you get 2 points. If the side with the most votes is not the side that you chose, then you get only a single point.