DC Comics is simply not interested in selling its comics to people who don’t already read them.
I’m not making this up. DC Comics Executive Editor Dan DiDio says so, all the time and on the record. Asked in a recent Newsarama piece why his DC Universe imprint doesn’t publish more low-priced entry-level comics, DiDio says:
“When we’re working with pre-existing characters and properties as we do in the DC Universe, people are mostly predisposed and understand who our characters are, so the idea of a wider sampling at a lower price isn’t nearly as necessary as it is with Vertigo.”
The logical conclusion, evidently, is to sometimes publish low-priced comics, but make absolutely sure that they are impenetrable to the general public, lest anyone not among the predisposed might be accidentally seduced into buying a Superman comic.
Full listing of DC's sales here http://pwbeat.publishersweekly.com/blog/2009/04/10/dc-month-to-month-sales-febroary-2009/
You wonder how these people stay in business