Well you say that what makes you special is your dedication and refusal to do drugs... in fact, that's always what all "naturals" say when people start questioning them. But it's obvious that dedication is not lacking. Every gym you go to, you will see plenty of "regulars" who have been breaking their backs day in day out for years, if not decades. With or without drugs, 95% of these people don't have the size you do, and 99.9999% of them will never reach the condition.
Your dedication is not unique. There are countless guys out there who, once they get a taste of bodybuilding success, are hooked like addicts -- it's not even a question of "dedication." You couldn't pay them to stay out of the gym.
It's not dedication. It's not genetics (according to you). So uh, what is it?