Its probably the shift to CGI, that keeps The Rock from being as "big" as Arnold. The focus is off the actor, and onto digital spectacle.
Technically, he's made more money though. so, in many ways, he is a bigger star.
The money argument is always terrible though. Arnold went from a guy who could barely speak English to an action star that people went to a movie specifically because he was in it. I don't think you can say that about Johnson and that's one reason he sticks to ensemble and family movies. The guy knows he can't carry a movie just as much as everyone else does.
Not only that but most Arnold movies were rated R, and probably almost all Rock movies are rated G. No shit he grosses more, all he does is churn out movie bait for families with kids. Rated G movies always made more money than the ones rated R
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