In a way or another it probably comes to money... camera men won't work for free.
In old race reviews you can definitelly see that there are more cameras during the night. Take a look at some random 98-99 race video from Youtube.
Another thing is that obviously the only thing you can see in the really dark sections are the giant lights of the cars, but it's still better than pitlane-esses-pitlane-esses-pitlane...
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