Gotham Central wrote:

I don't understand this, what difference does it make?
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Not all distribution points carry all titles. I rather have a single Batman series with more issues per year that follows the exploits of Batman that I know will be on the shelf of my local new stand. Then, if I choose, I could also choose to purchase Detective Comics, which would have story arcs involving the rich tapestry of characters from the Batman Universe.
Superman would be all about the blue boyscout, while Action Comics would mine the Superman franchise for other stories and characters.