Rob hints us to what makes an entrepreneur - not the ability to take risks - indeed it is an "ego" problem:

"Just how much appetite for risk do entrepreneurs really have? That's the question Wharton doctoral student Brian Wu began asking himself while examining their behavioral patterns. He found the general assumption to be that entrepreneurs are risk seekers -- but the empirical evidence suggests that, surprisingly, they weren't. But if entrepreneurs are more cautious than everyone presumes, then what accounts for their risk-bearing behavior?

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Entrepreneurs, like everybody else, hate uncontrollable risks, but on the other hand, they're overconfident in their own abilities -- they think they can control their abilities in a random drawing of people. It's like the Lake Wobegon effect in assessing their position among peers. They think they're above the average."