Slipknot tours in 4+ buses with 3+ semi-trailers. They have a stage show that's enormous, a production crew, road crew, flights, drivers, managers, and the band. The label covers those touring expenses up-front, and recoups from album sales. The band lives off of guarantees and a portion of merch sales. This is how it works, for those of you who have no idea what the background financial process is.