Only Siege was really line-wide. 2 of those were unconnected mini series (they no longer officially do mini series outside of event leaders). Half are cosmic stuff where most of the books were cancelled to the 'Realm of Kings etc' stuff kept the line running.
A quick scroll down shows 4 in 2011.
I'll concede though that maybe some of these new ones are similar and split off.
I mean maybe I am an old man moaning, that happens, I'm no longer really down with the hit parade but I am very enthusiastic for comics more than not and have to admit I find it difficult to follow a lot of Marvel nowadays even with access to the entire line. My sincere belief is they keep driving the same short term gains (events and relaunches) that decline in influence the more they are done.
If someone rarely ever reads them are they best placed to judge why people have fallen away from Marvel and their sales have declined? Part of my experience is being told Spider-Woman was good (it was) going back to read issue 1, it was in the middle of a story, then having to search around and see issue 5 of the previous series was where the story actually started. And I'm no newby, they'd be screwed.