Why Marvel Can Change the Universe and DC Can't

From my brief knowledge of Marvel Comics I have noticed one thing in particular. They like to change the universe, a lot. Take for example Civil War a giant mega-crossover that changed the course of every series it touched. My argument here is not that this kind of strategy is a bad thing, just that is a pain in the ass to catch up on. I haven't been reading Marvel for hundreds of years so I don't know what they mean when they mention a reference from Secret Invasion in a Marvel NOW series. I don't think that this is fair for anyone who wants to read a quality comic without having to buy every single comic that preceded it. I am however, enjoying how most have the Marvel NOW series have been based off of AvsX. I am not saying that AvsX was at all decent (it wasn't.) It's just kind of neat to see how the X-Men are dealing with Scott Summer's being so changed. That being said I don't think they should stop putting out big Marvel events (Mostly because I want to be able to read them as they come out, now that I have a better sense of the Marvel Universe.) I just think that Marvel should think through what will happen before they write the story. I say this because now with Marvel it seems like all of the writers who are writing about the aftermath of AvsX have to compensate for their co-workers lame story by writing about something that was minor but interesting in the event.
This is a problem that only Marvel has to deal with (Enter DC Comics.) It seems as though DC is scared to ever change anything in their universe. What was their latest event? Flashpoint? All we got from that was an origin reboot. If anything I would have DC do a what-if story. Take Deadpool Kills the Marvel Universe even though I haven't read it, it seems like a fun story that would never actually happen but is cool to read about. May I suggest Lord Grayson, an alternate universe where Dick gets so drunk on power when he is Batman that he decides to kill Bruce when he returns and disbands the Justice League, making him the king. And what if Jason then challenged him for the throne? The main question is why not?
What I want to summarize about this post is two things. Marvel is too ambitious and needs to work on the actual content of their mega-events and DC needs to be more ambitious and throw a curveball sometimes. Please tell me what you think about it and if a Lord Grayson storyline is a good idea.