After some careful thought I have decided to publish exclusively with Amazon.com. Although I very much like having my novels available in all formats, in the end my objective is to expose my work to the greatest number of readers. In the time that my novels have been available on all of the outlets that are a part of the Smashwords distribution network, the vast majority of sales have occurred at Amazon. Now, by going exclusive with Amazon, I will gain greater distribution opportunities on their site, and more promotional control as well.
To anyone whom this might inconvenience, I can only say that I am sorry, but, I truly believe that as a part-time author this is the best means of increasing exposure.