How Much Are People Paid for Commentary Tracks?

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I’m always curious about the nuts and bolts of things like this. I figure most movie stars that don’t have it as part of their contract charge an arm and a leg.

I’m more curious though about non-filmmakers though. Like film historians, critics, etc. What do those people make per track?

The latter are very hit and miss as some definitely earn there money. Others can be a chore to sit through though.