Budget, since IMSA does more racing a year than the WEC does, as the WEC outside of LM is only 6 hour races, while most IMSA races are 3 hours, but they have the odd 6, 10, 12, and 24 hour races, plus more races by number/volume a season.
IMO, the only cut I'd make would be to PLM, but make it like it was back in the ALMS days of 10 hours or 1000 miles, which comes first.
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