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From what I understand, the heat range doesn't affect the sparks ability to ignite the fuel much, but more so affects the life of the plug, to cold and it will foul, to hot and the tip will get hot and cause pre-ignition.
you have to get mighty cold to be a super conductor, so I suspect that a slight rise in heat isn't going to prevent a spark from jumping, altho I have read about surface gap (like Bosch platinum +4 plugs) tend to be hotter, because the spark is traveling so close to the ceramic insulator, and absorbs some of the sparks heat, this was out of an SAE automotive engine efficiency book that I read years ago.
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