How exactly can leaks be damaging to Marvel?
Leaks about projects can both affect how a book is ordered (if information comes out too early, thus having become more “old hat” by the time it’s actually time for retailers to place their orders) and by what impact such revelations might have on other books the creators are working on (such as knowing that creator X is going to be doing a new project, which implies that his current project will be coming to an end.) Plus, it’s unfair to the creators who work very hard to not only come up with these stories, but to deliver them and the message behind them in a specific way.