Yes, Sylvester Stallone made a significant amount of money from the Rocky franchise.
While his initial salary for the first Rocky film was a modest $35,000, his contract included a crucial clause: 10% of the film's back-end profits. This decision proved to be incredibly lucrative for Stallone, as Rocky became a massive success, earning over $225 million worldwide.
Stallone's 10% cut of the profits ultimately brought him close to $2.5 million from the film alone. He continued to make money from the sequels, including Rocky II, Rocky III, Rocky IV, Rocky V, and Rocky Balboa.
In addition to his back-end profits, Stallone was paid salaries for each of the Rocky films. For Rocky III, he earned $120,000.
Although Stallone did not retain ownership rights to the Rocky franchise, he continues to earn income from the project through his back-end payments.