You might be interested in knowing what I discovered by personal experience.
The number of SkillPoints that you achieve for each Official Time you race, looks like it is calculated by:
(number of players that have completed an official time on that track) * 60 / (your world ranking position)
Then, the result is rounded by some amount, but this is the general logic.
I don't agree with this system, because as noted in many forums, most people only work on the first 4 tracks to gain a huge number of points, and people are discouraged in gaining access to the most difficult tracks - which are definitely the most beautiful tracks of the game! (A01-A04 are sooo boring!!)
In the entire Italy, only me and a couple of other players have mastered the Nadeo on the 5 black tracks, and this is really a pity.
What I would have preferred, is to have a fixed quotient for all tracks, for example SP = 1'000'000 / ranking, so that all track have the same importance: if you are one of the few in doing an official race on a black track, you will gain a better ranking due to the fewer number of players, but in that case you *deserve* a lot of points!
With my system, if you happen to be the best in the World on *all* 65 tracks (!), you would gain 65 million points.
This would be very easy to understand by all players, and it would provide a much more competitive SP challenge.
However: with the current formula, if you make an official race and you obtain the very worst time in the World, you gain 60 SP. Instead, if you obtain the very *best* time, you gain 60*Players points, which for the first 4 tracks means around 2 or 3 millions. On the E04 track (the hardest for me - my 260th medal!), it appears that only 477 players in the World have raced an official time, so you can obtain at maximum 28'620 SP.
(Only *141* players in the World have completed race E05 - easier but veeery long, but as noted in my other post, many other players could have my same problem in uploading a 13 minutes replay to the server!)
If you have in mind the graphic of a formula y=a/x, you can imagine that you will start to obtain *a lot* of points when you approach the ranking position = square root of the number of players. Below that ranking, you always obtain few points, close to the result obtained by players with a ranking similar to yours. Above ranking=players^0.5, you get a huge number of points each position you gain. Of course, the player #1 has twice the score of player #2 and 3 times the one of player #3.
For the most played track, A01, it looks like the number of players is currently around 52'038. So, as a reference to obtain a lot of points, the player position to win is 228 (which is the rounded square root of 52'038).
I'll use this technique in order to see how much below (or above!) I'm from the reference position, and to decide which track to concentrate on, in order to gain SP ranking.
If you want to know an approximation of how many players raced on a specific track, simply multiply your current skillpoints number by your world ranking position, and divide by 60.
For example, on track C03 I'm currently 6th in the World (sigh! one month ago I was 3rd!), and I have 174'617 SP.
6*174'617/60 = around 17'462 players raced officially on that track.
Last note: I find that with the current system of scoring, the most fun part of the game is the solo / medals challenge. It is the only one where good driving is really of importance. With the skillpoints you are limited to too few tracks, and in the multiplayer sessions the ladder points are based more on how much you play instead of how good you do. Moreover, though the user tracks are generally wonderful and very fun, it's more important how much you know by memory that specific track, compared to how well you drive. Good LP winners should download and study each track on a server, and always use that server to play.
Now that I obtained all the 260 medals, I'm a bit sad that the best part of the game is gone.
I'll improve my skillpoints on every track, but it's not the same fun due to the poor scoring system.
Luckily, I didn't experience track-building and replay-editing so far, so I still got a lot of things to do with this game!
Definitely the 20 euros best spent in all of my life!!