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Possibly two reasons. First F2/F3000 was not a compulsory step to F1. Second, Euro F3000 and F-Nippon aside, there has only been one F2/F3000 championship in the world, whereas there have always been lots of F3, F-Renault series and other level 3 categories. Most drivers who have reached F1 have not gone through F2/F3000 and as a consequence the chances of somebody winning an F2/F3000 and F1 championship are probably quite low.
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