Why does the Rolex Series split the classes up?

Q: I've noticed that the Rolex Sports Car Series seems to have two separate races instead of running both classes at once. Anyone know why they do it? I know ALMS runs all four series at once, and the field is pretty big. Rolex fields aren't THAT big are they?

A: They should definitely be run together. No, Rolex fields aren't THAT big.

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