I'm considering dropping the DC Super Heroes sets, as I've been a Marvel Zombie (as well as an official member of FOOM and a No-Prize recipient) all of my life, and the DCU has only been on the periphery for me (save for occasional interest in Green Lantern).
The main draw of the Super Heroes sets are the minifigs, and I don't connect with the DCU ones (for the most part).
I am more familiar with Marvel because of all the movies. If there were more DC movies about than Marvel it would probably reverse itself. If not for the movies I would know hardly anything at all about most of the superheroes. I did not read any of the comics from either publisher as a kid so really did not get interested until the Nolan Batman movies, the first Spiderman movies, the X Men movies, and all of the Marvel movies starting with Ironman started coming out. Even then, I Did not have an interest in the Lego sets till this last year when I came to the conclusion it would be nice to have some of the more well known superheroes for fun displays in my large modular city that is constantly growing with custom and official modulars.
I still have not read any of the comics but I have done a lot of reading up on the backgrounds of various heroes, their incarnations and the various ties they have with each other by reading up on wiki's. All the media that is out there is very intimidating which makes it hard to want to start reading it but the depth of the universes and all the connections and stories are quite fascinating.
The other draw to comics was I get to see a lot of bishoujo superheroes in Figure GAF which is the other primary place I hang out in on GAF so whenever a new female superhero figure is posted I have to look up the story. The Kotobukuya line always looks fantastic, way better than Western scale figures for prices way cheaper than Western figures at around 50 dollars a piece if you buy it when it is released. The only two Western figure makers that have standards as high as the main Japanese companies is Hot Toys and Sideshow and both of those cost a ton. Plus they make a different type of figure than the ones I buy. I actually get mostly game or original concept 1/8 and 1/7 scale figures and some anime related ones. Used to be more anime but there has been a growth in the number of original concept figures that appeal to me a lot. But I digress, back to LEGO.