If the bad trees were not marketable, they wouldn't leave them, because they will NEVER be marketable.
Based on that statement, it is obvious that you know even less about timber management than you know about deer management. When a logger bids on a stand ,his bid is base on the value of the marketable timber. He doesn't give a rip about the unmarketable trees unless the contract forces him to cut those trees. Then the cost of cutting those trees is deducted from the bid price. But, most contracts do not require the removal of non-marketable trees , so they are left standing and only the good trees are harvested.
The analogy of high grading was provided by Dr. Demarais, not me, so why don't you send the good Dr. an e-mail and tell him his analogy is precarious?