Right. I think the poster is missing half of the equation. I know lots of people who work really hard at what they do. But what they do just keeps the afloat, so they can go back in the next day and work really hard again.
The other part of the equation is being smart, watching for better opportunities, working on things on the side, or even quitting your job and living off of ramen while founding the Taginatr2000.com.
When I think of working hard in an entrepreneurial context I'm thinking of someone who's breaking down barriers, being relentless, striving for greatness (not just "good enough"), taking on tasks others would be afraid to, etc. Generally just pushing beyond the boundaries of what most people are willing to do.
I know a few people who are ridiculously successful and they all work (or worked) so hard that your average person couldn't handle their workload for even one week.