Faulty ignition coil... again!

On my Dart 1975 I had to change the ignition coil in August 2015. Now two years and not even 3000 miles later, again, the damn coil was faulty. This time I bought the most expensive available at Rockauto hoping it will be more durable. But I wonder what you think of that, if I changed two, it's just bad luck or if I should check out other components which explain this. Thank you for your help and advice.