Why do I receive different amounts of points for the same finishing position in different races?

^{Points are earned in races based on the average strength of drivers in a race as determined by iRatings and adjusted for field size.}  

^{Points are adjusted for field size so that there are no point advantages for driving in larger or smaller fields.   Points are also adjusted for the skill of opponents based on the iRating of each driver prior to the race so that there are no point advantages for driving in weaker fields.}