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PaulMy late uncle was a fairly prominent collector/dealer on the east coast in the early to mid 80's, and generally went with options B and C, in that order. If the seller told him to "give me 50 bucks and get this stuff out of here," my uncle was happy to oblige. (One such transaction netted at least a couple of '54 Bowman Williams cards, as I recall.) If asked what something was worth, though, he'd provide an accurate appraisal, then offer a percentage of that.
Funny you bring up the "Wagner dilemma." I was pondering the same question after reading about that new T206 find.