Well, it's no surprise that so-called "12 volt" coils frequently burn out. The heat generated by the series resistance has to be dissipated whether it's in the coil or in an external resistor. And coils aren't designed to dissipate heat. Leave the ignition turned on for a couple of minutes with the points closed, and you'll find the coil gets very hot. And the heat (from my coil, at least) seems to be concentrated near the top of the coil.
About all you can do, short of installing an external resistor, is be careful not to leave the key on with the motor stopped.
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