I was never sure of the multiply thing; I set mine to x1. But the 'add for all users' is intended to give users a basic starting point, perhaps to absorb any negative points they receive. If you look at the last few pages of users, the majority have 100 points, which is their starting points.
I changed my Q2A to start with 10 points, and simply display "0 points" for all users that went into the negative.