One way is to look at the sales of their albums and concert tickets. According to Billboard, Skillet's latest album, Victorious, debuted at number 1 on the Billboard 200 chart in 2019, selling over 83,000 copies in its first week. The album has since gone on to sell over 500,000 copies worldwide. Skillet has also had success with their concert tours, selling out arenas and stadiums around the world. In 2019, they grossed over $10 million from their tour.
Another way to estimate Skillet's earnings is to look at their endorsement deals. The band has partnerships with several major brands, including Pepsi, Samsung, and Chevrolet. These deals likely bring in millions of dollars each year.
In addition to their album sales, concert tours, and endorsement deals, Skillet also generates revenue from streaming services, merchandise sales, and publishing royalties.
While it is difficult to say exactly how much money Skillet makes in a year, it is clear that they are a very successful band. Their combination of chart-topping albums, sold-out tours, and lucrative endorsement deals has made them one of the most successful Christian rock bands in the world.