If only one person from the wedding party remembers your name, you're on your way to building a business that's big enough to hire other DJs. When you're the headliner at a club, you're the pilot and your passengers will flock to buckle themselves in for your ride.
Being a famous DJ doesn't mean you have face recognition, which is great because considering the salary, you may have to rob a few banks before you retire.
But if it all goes right? Think Skrillex, Diplo, Carl Cox, DJ Tiesto, Tony Okungbowa (Ellen's DJ), Carson Daly, and Howard Stern. You could do worse. A whole lot worse.