I don't know about that Punchy. DC's release method built up hype and encouraged readers to try most/all of their offerings. A lot of readers bought all 52 new books. The issue is that most of them weren't that good, which led to diminishing returns when the second, third, fourth etc. waves of new titles are released.
Marvel's release method is to space out new releases, but aggressively double-ship books, thus forcing retailers to make decisions on what books to stock more of before the first issue of a comic hits the stand. Retailers aggressively ordered on the first issues to get alternate covers and then quickly pushed their stock down back to pre-Marvel NOW! levels. Marvel didn't let the market set the sales level for their books.
Most of DC's books have seen 30%-40% declines over a one year period. All of the Marvel NOW! books have seen 40-50% declines in one month.
Honestly, what DC needed to do was not put second-rate talent on 45 of their series. Had they done that instead of having Tom DeFalco write 3 of their books, it'd be doing a little better.