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The dirty secret here is, all of those are selling and buying from each other, and I have seen 1 lead come across from 5 vendors at once when most of those vendors claim the lead is not sold more than 3 or 4 times. A couple of them claim to be monitoring how many times the lead is sold on each system, however, I've found that to not be true.
No "secret" here, this has been going on forever.