John,
Good question, but I believe the answer is that most of us share good information with each other because we realize that, even though we do compete with each other in a sense, in a larger sense we all share the common goal of fighting the same almost impossible odds, and we are all human and care about each other more than we sometimes like to admit.
These threads are truly a great treasure, not to be underestimated or taken for granted. And, although we do not always agree with each other (why should we?), freedom of expression adds to the value of S.I. Yes, sometimes we argue, but I rarely see a squabble carry over a weekend.
Bill
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