Generally, I prefer a working NES to a non-working one, regardless of how it's made to work. I personally have had decent luck re-bending the pins in one of my NESes, so I haven't tried any of the aftermarket 72-pin connectors, but I can see why some folks use them. If I had a NES in which the connector appeared to be physically dirty, I'd probably apply DeOxit before I tried anything along the lines of 'boiling', as that sounds like it might do more harm than good.
-Adam
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