I can only speak from personal experience. I got a low DSR one time from a competing seller. He bought my card really cheap via auction format (1959 Roger Maris PSA 7) and then listed it thru his store for around $60 more. He dinged me with 1's for shipping charge if memory serves me right, and the ironic thing is, as a seller, he charges the EXACT same shipping charge as me!!
I file that under COMPETITION STAR DINGING - where a card seller tries to drive a smaller card seller out of business by reducing his profit margin. Without the 20% discount, a seller with thinner profit margins to begin with, might easily turn away from Ebay once they lose that discount.
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