Before someone asks, here is the clarification
Why are the driver and team prices so low?
Wait for 2 races and you be crying why the points are high

The script has built in intelligence so as to say

it will learn as the season progresses. So the teams and drivers that do well, will be much dearer and those who do badly will be err cheap

And no this is not decided per race. An intricate coding system has been written(which btw is still under more refinement) to ensure that the prices are perfect and which takes care of fluke wins.