I saw one of the escrap buyers mention in a different thread that certain boards were definately worth more than others, for instance some of the old fingerboard cards had much gold plating than others, but they go through such a high volume of boards sent to the refiners a month and are of such a wide variety they can't really offer specificly higher rates for certain boards that would likely yield more gold. Like filthy and mechanic said though, if you had a huge amount of one specific type they could probably run asseys and figure out the value of that specific type and possibly pay a little more but you'd have to have a ton of those to make it worthwhile.



I would also wonder if the non-precious metal weight of the boards has changed over time... perhaps the worthless material was a higher percentage of the weight back then, which could even out the gold recovered per dollar spent on boards.