Initially Grand American ran ovals because the France family owned a bunch of them. Once we got the merger, along with that came Road Atlanta, the Glen, Mosport and the rest of the current schedule. The rovals were included in the beginning because the Frances needed those dates so what little money was made stayed in the family, and they were cheap to operate because otherwise they would have just sat there between Nascar dates. Once the classic tracks came back, there was no room on the schedule for them.
Either way, they were fun, and they were different from the usual sportscar venues. I kind of miss them, but we will always have Daytona.