why (in the resell market) do pl20s sell for much less than re20s if they are basically the same mic? and why do sennheiser 441s sell for almost the same as 421s when brand new theyre about $500-$400 more? not complaining, i'm just curious.

Maybe the stores aren't doing their research.. or maybe they can't conceive of someone actually paying $800 for a mic and figure they can sell it quicker at a cheap price.