Yes, NASCAR is trying to maximize ticket sales. I guess their logic is that if a race comes to a given track only once per season, odds are better that there will be high demand for tickets, meaning sell-out attendance and since supply and demand principles are in effect, ticket prices can be higher.
I would like to see Rockingham and North Wilkesboro get some Sprint Cup attention, those are great tracks. As for Fontana, I don't think they have ever had sold-out attendance. NASCAR did have to red flag a Cup race because of all the trash coming out of the stands and onto the track.
At least Kentucky is a 1.5 mile track. The 2 mile or longer ovals tend to become boring races unless there's a pile up and that's not racing. I like shorter tracks where drivers can pass and battle for position the entire length of the race.