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The journals will get their financing from libraries and other upfront payments (privately funded or university funded). Finance is not the issue with journals, it is (in this case was) about their restriction to just leading scientists or people who could afford to read it. Now their work can be scrutinized and read by everyone, obviously the big names in the field will still do most of the rebuttle or validation of papers but as youngsters become more tuned in to leading science then we will see a great acceleration in interest and hence more economic interest.
This is how science should really be, it should be publicly open to everyone to really rip it's claims and mathematics apart. It is also a way in which the gap between leading science and other lay fields or layman can be closed.
Read more at Nature leading scientific journal :http://www.nature.com/news/open-access-deal-for-particle-physics-1.11468