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I had heard a while back that Champ Car/CART had an agreement with Formula1, to not frequent the same tracks in the same year.
Because it might reduce the amount of fans at each event. Since casual fans do not know the difference, they might see them simply as both openwheel cars.
And also the hardcore fans will tend to compare lap times if they raced on the same tracks. Even though F1 is clarly faster, Indycar vehicles derive more speed per dollar. $500,000 car vs $2-5 million at the top end.
F1 is more prestigious but its exclusivity can put off some fans. Meanwhile Indycar drivers are more accessible and the races are cheaper.
So both series want to avoid being compared.
I don't know if that agreement is still in place since the Champ car and Indycar merger...