One out of 10 passing makes a person as a SS contributor? That will be a much easier than 7 out of 10 criterion (I passed on my fifth try couple of months ago).
With the number of new contributors increasing, the number of uploaded images (or footages or others) will jump as well. As a result SS reviewers have to spend a lot of time to review and to reject those images (or footages or others) from the contributors who pass only 1 out of 10.
That will be a lot more work for the reviewers!