What are the purpouse of A-Spec and B-Spec points in Gran Turismo 4?

Question

I'm talking about the points that you win after a race depending on how hard the game calculates the race to be by your car's power abd weight... A-Spec points and B-Spec points.

Do you get a prize when you get so many of them, or what?

Answer 1

A-spec and B-Spec game modes

The new B-Spec mode puts players in the place of a racing crew chief: telling the driver how aggressively to drive, when to pass, and mandating pit stops (by monitoring tire wear, fuel level, and oil dirtying). The speed of the time in the race can be increased up to 3x, allowing for Endurance races to be completed in less time than would take in A-Spec mode (normal first person racing).

B-Spec points are given out for each race completed in B-Spec mode. This increases the skill level of the AI driver in different skill categories. Players can thereby use B-Spec mode in harder races as the game progresses.

Similarly, a player now accumulates A-spec points if they win races in A-spec mode. Each race event can yield up to a maximum (sometimes only theoretical) of 200 A-spec points. Generally, a win using a car with less of an advantage over the AI opponents gets more points, but the algorithm used to evaluate "advantage" seems flawed at times. Points can only be won once, so to win further points from a previously-won event, it must be re-won using a car with less of an advantage over the AI. After a large number of events have been completed against challenging AI fields, a player's A-spec point total corresponds somewhat to their skill level.

http://en.wikipedia.org/wiki/Gran_Turismo_4