Question regarding DLRC Auctions

Is DLRC auctioning consigned material in their "Internet Only Auctions", or do the coins come from their own inventory? If they're simply auctioning only their own material, why is there a "Buyers' Premium"? If not, does anyone know what their "Sellers' Premium" is?
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Regardless of whether it was their material or consigned, I had the winning bid on a
nice 1942 T1 5c PCGS PR67, so I'm happy!
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