Arnold seemed to have perfect timing all throughout his life/career. He was always in the right place at the right time. All the D-bol he took didn't hurt either. The steroids gave him even more drive, determination and focus... which he applied to other areas in his life, not just BBing. He would have been 50% less successful without the roids, probably would've been some type of businessman/real estate mogul.
99.99% of BBers will never achieve that level. Sure they'll win a few trophies, start garbage supplement companies and make some money for a few years, but that's it. They'd better have another skill set besides picking up heavy things and putting them down.