Quote from OddTrader:
"That's possible, I think."
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Not only possible but guaranteed, you will build your account size until there is a major panic. At this point,the market will dump, offers will be sky high if there are in fact any due to volitility going thru the roof. Then the margin calls begin. You're caught between a rock and a hard place, from here just pray for mercy, but you probably won't be heard! Only summerizing many other unsavory steps in the process.
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"Do you know whether usually an options broker will automatically take required action in order to avoid unlimted loss, just in case? Or the trader's loss is (legally?) limted to his account funds? If yes, that would be a good gambling way!"
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In Australia you must give the broker the right to liquidate your account if he feels this is necessary to protect their capital. You are also legally liable for all your losses, and the courts can order your assets seized to cover losses. I see no reason why it would be different anywhere else!
Naked Put writing is not something to be taken lightly!
Regards
Johno