Once you reach that tipping point, it means that people will go see a movie simply because you're in it. Before you reach that point, they have to first be interested in the movie, and secondarily be interested in the fact that you're in it.
(up until Focus bombed) People saw that a new Will Smith movie was coming out, and they were ready to buy tickets. That wasn't the case when Independence Day came out, they got interested because of the alien invasion, and then later were like "hey, will smith was awesome in that. i'd see him in another action movie without hesitation."
"this is okp tho, reading is completely optional" (c) desus