On the flip side... how many successful people have you interacted with, that DON'T work hard? (Again talking about financial success, since it's a measurable thing, and can greatly influence success in other ways).
I know a bunch. Most of them inherited wealth and did nothing to earn their financial independence and success (aka they knew people, their parents or relatives). In fact, I recall reading that there's a statistic that the majority of wealthy people ARE in fact 2nd generation or later benefactors of financial gains by their family.
I never interact with wealthy people. Don't run in those circles. Some people I work with in the office might be considered lazy, but most of them worked hard at some point in their lives.
I did know some wealthy people back when I was younger, and the second generation types were generally lazy. Of course, they mostly died at an early age due to partying to much and living unhealthy lifestyles. Not sure if I would categorize them as successful.