@Bruce - I'm seeing the largest grouping at >2MM myself, would be more interested to see a further >3MM bracket. I was also surprised by all the relatively HNW ER's, given the younger skew of this crowd, but there is also some confusion on PV of expected benefits, which certainly are valuable too, but throw off things due to assumptions on inflation, etc.
@soccerluv - +1 In fact, I would go even further to say, the more I read about FI and RE, the more individual it becomes. I would also add, it is not so much the size of the stache at RE as it is the returns in the market post RE. For example, if I RE'd in 2009 figuring I can live on 3-4% SWR, I'd be in hog heaven with the annual returns since, and even have buffer for extra spending or a downturn. On the flip side, if you'd retired in 1999, returns (even with dividends, on S&P) were -9.1%, -11.9%, and -22.1%. That probably would've sucked, especially in Early retirement, without pension or SS.
(ref -
http://en.wikipedia.org/wiki/S%26P_500).
So the best generalization I can come up with is that there are conservative folks who pad the stash for various reasons (like their job, good work/life balance, golden handcuffs/benefits, have kids and want to pay for college, nervous about a market downturn, etc.) and there are ER at 4% folks (hate their job, don't have kids, got laid off and 'giving it a shot', entrepreneurial endeavors are more rewarding, etc.).