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I tend to think that so long as the sample size is large, it is irrelevant what percentage of results it captures so long as it is safe to assume that it misses at random (that is, it's misses contain a representative sample of wins and losses).
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You make a good point but I don't see how it can be trusted; ie, NOTHING is safe to assume about it. Why should anything be safe to assume about it?
I think that it's a travesty that someone could even consider selling something that isn't halfway complete... AND it's completely unverifiable. BTW, the
guy who runs it seems to be a scumbag.