Because they are successful at mailing it in. Nothing about their music is original. They sound like dozens of other bands you hear on the radio. Bands like them, Seether, Theory of a Deadman, Shinedown, etc etc... if you took someone who hadn't heard any of them ever before, made a mix CD of several of each of these bands' songs and gave it to them, they'd think it was the same band. It's unoriginal drivel. They simply use the same beats and riffs to make the same fucking songs over and over again.
They have no creativity or talent. They are successful because they pander to a retarded audience that likes songs about chicks and beer and rocking and rolling in the free world. they are everything that is wrong with music. They are redneck Gods. They just rinse and repeat their songs...
They are the quintessential poster children for the "AMERICA! FUCK YEAH!" culture... yet they're Canadians