ZapperZ said:
Practically all journals, be it open access or not, have publication fees.
That is not what my experience has been. So far I have four publications at the following journals:
Journal of Classical and Quantum Gravity
Physics Review D
Journal of Foundations of Physics
Journal of Mathematical Physics
None of them required publication fee. Although, at the same time, the only one of those where I was a single author was Journal of Foundation of Physics one. So its possible that with the other three publications my co-authors have paid. But I highly doubt it, because if that was the case, there would be some discussion on how we are to split our payment or something, which there was none.
One thing I *do* remember though is that when I submit the paper to one of those journals, they all say that *if* I choose my papers to be open access, *then* I would have to pay the fee. But making it open access was optional, not required. So that's why I am thinknig that open access journals are "forcing" me to pay the fee by "requiring" said open access (that is optional otherwise).
I also remember, few years ago, I "almost" had my paper published in one of the open access journals, until a few different people I talked to stopped me from doing that, precisely on the basis that the journal was fake. Unfortunately I don't remember the name of that journal -- so it probably was *not* either of these two journals I am talking about now. But here is what happened. I submitted a paper there, and then I got referee report, with recommendation to publish it. But one thing I noticed in that report is that the referee said "In this paper the author did such and such" but instead of "such and such" he just cut and pasted some portions of my abstract. So why did he have to cut and paste the abstract instead of summarizing it in his own words? He then said the paper was worthy of publication. And that was all there was in that review. He didn't give any of his own thoughts or suggestions -- which is also weird. Then the editor asked me to pay publication fee. So I was surprised about the publication fee and asked a few people I know, and they all said the journal was fake. I remember one person said "If they ask you to pay, don't pay". So that phrase suggests that most legit journals are free.
But like I said, that is not the journal I am talking about now. That was few years ago and I don't remember its name. The reason I am suspicious of the journals now is because I remember that quote "if they ask you to pay don't pay".