Every couple days Marvel puts up serveral free comics for download to my iPad, every few days (sometimes more) DC puts up 2 page origin's or 10 page previews of comics, with every a full comic every now and again.
Well getting several full issues for free every couple of days is obviously the better deal. And because of that i have bought several story arcs off there when i got interested.
Sorry but i'm the kinda guy that needs more then 10 pages to really get interested in something. And the 2 page origins are good for what they are, but they don't really get me interested in that character anymore then I already was.