David Hall Rare Coins: Bargain Central?

Whoa, just stumbled across a less-than-hour-old eBay auction listing from DHRC for a 1975-S PR-69 DCAM Jeff (73/0) with a $99 BIN. This coin has consistently sold in the $170 to $230 price range for the past year. Needless to say, I bought the puppy.
I also have acquired some other coins from DHRC in past months that struck me as bargains and all met stated slab grades. What gives?
They can't be unaware of going prices, can they? Tossing a bone to the masses? homerun?


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Russ, NCNE
WH
(now you can tell me what they should be worth!)
The Ludlow Brilliant Collection (1938-64)
The Ludlow Brilliant Collection (1938-64)
The Ludlow Brilliant Collection (1938-64)