I just read this on Forbes... interviews on many subjects with 20 self-made billionaires. I didn't count, but most of them said that hard work played a big role on their success.
Secrets Of The Self-Made 2007 - Forbes.com
Of course, you guys must know better than those dumb billionaires who know nothing about life who worked so hard to get it instead of just sitting and waiting for the money to come through their window, right?