No. I read from every publishing companies. Dude, you don't know what you're missing out on! All of those publishers have some of their own best stories. Give them a try. You won't be disappointed!

I used to be a DC-only reader like you, but then I took an arrow in the knee.

What I mean with that is, I now read things from other companies too, but occasionally.

I mostly started reading other companies because of writers, like Millar or Gaiman, then because of some stories that seemed good (like that anthology comic about a car and it's many drivers through time, or second coming that was supposed to be in vertigo)