Somewhere, I thought that I had made the statement that the answer to the question "Why is there something rather than nothing" was "because there are more ways for something to exist". An example would be that the number of elementary particles in the universe could be more than they are in our universe, or less, or configured differently, etc. But I can't find the actual post. Regardless, Richard Carrier makes the same case in more detail at his FTB blog from March 2011 - somehow I missed this.
Scroll to the section "Getting Everything from Nothing".