I think 'highest grossing' typically means their movies made the most money, not that they themselves personally made the most money.
in 2013 somehow GI JOE 2 made $371M worldwide, added to FF 6 $790M,
Pain and Gain $81M, and Snitch $48M =$1.29B
which is a higher number than Iron Man 3.
Iron Man 3
Worldwide: $1,215,439,994
and the amount of the $790MM that FF 6 did that can be attributed to the Rock is about 87 cents.
True, so it pays differently then right? Like when those bench players get a championship ring and a salary bonus.
You ever wonder if a Key Grip or Best Boy (whatever they are) tries to argue that they're the highest grossing one of those things?