I appreciate your concerns. As for the people I'm talking about. I know that many are just very short term traders. I don't want to use names, but I've seen one who just trades 1 stock at a time, he takes mid 5 fig positions and scalps for quarters and halves. I don't know if you believe it's possible, but I've personally seen him have 6-figure days. No leverage of course for him.
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As for me, I believe I've experienced a few 6 sigma events. I was over 100% long on sept 11, as the market began to drop. I added exposure up to 150% or so long before the halt. When we reopened, I was sitting on nearly 15k in worthless call options, and another 20k in open losses. I somehow managed to claw my way out of that mess and close the day with a small gain (extreme volatility is your friend I guess). I think that was a 6 sigma event, or as close to one as you can find, though I bet nuclear winter is a step further into extremes. I have said this before and I'll repeat it again. I take a lot of risk. I will never blow up. I have way too many internal controls for that. If I suffer a 20k loss, I'm done for the day. No questions about it. Buying bottoms will always work. There will always be bottoms in the market. There may never again be readable trends, but there will always be short term bottoms. As long as one individual stock or trade doesn't destroy me, I'll be able to make back any ammount that I ever loose.
I've not had a drawdown from peak to trough of over 15% in almost 2 years. I've only have only had about 3 or 4 that were over 10%. The most recent one was 2 weeks ago, and I rebounded the next week with a 30+% acct gain in the following 7 days.
Finally, when I talk about accounts, I am referring to my trading accounts. I have a seperate account for longer term stuff and I sweep my trading gains periodically into the other account to make longer term investments. If you don't trade all your money, there is very little chance of blowing up.