I am not big on options, I use them from time to time and I have always been a buyer when I have seen occasion to use them. My own personal opinion would have been that the writer has an edge generally speaking, for the simple reason (as others have already stated) that the underlying can rise, fall, or stay more or less the same (trade sideways)
Since the subject of this thread has been puts, that would mean that the put writer will benefit if the underlying rises, if the underlying trades sideways, and even if it moves down, provided it does not move too far through his strike.
The only thing that worries me about this, is that it appears blindingly obvious, without any great research or study, and it has often been my experience that anything that seems blindingly obvious in the markets with no work, study, research, has a nasty habit of turning out to be quite different in reality. I suspect there is a lot more than meets the eye.
This thread hasn't changed my views, although it hasn't I'm afraid added to them. Proving such a hypothesis would be a far more complicated process than successfully executing a series of profitable trades. One has to consider that while Socrates has been profitably writing his puts "to prove writers have an edge" someone else has been writing calls, I presume with somewhat less success.
What has been displayed here may simply be a nice piece of trading that has nothing to do with a "writing edge"
For those that are interested in trying to work out if there really is an edge, I came across this whilst doing some reading on the subject.
http://1option.com/index.php/global/comments/all_options_were_meant_to_be_sold_not/
and this
http://www.esignallearning.com/education/marketmaster/archive/1205/121605.asp