In each challenge 'Rules' section you can see the amount of votes needed for each level.
As the GuruShots community grows we have to adjust the amount of votes needed for each level from time to time.
There are two main factors when we set the new amount of votes needed:
1) We review past challenges of the same subject and predict the amount of activity these will have.
2) The number of members on the site translates into a number of members in challenges and total votes done.
We take the average amount of votes and make sure that the levels allow members to reach their proper skill level in the subject.