Recently I was kindly offered to become an editor for a new open access journal called ALGORITHMS published by MDPI. At first sight it looked as a great idea, and the editorial board contains some very impressive researchers. However, when I started to read the instructions for call for papers more closely I realised that the authors of an accepted paper have to pay roughly 1000 CHF (roughly the same in Australian/US dollars).
So instead of letting the readers pay for the journal the authors have to pay for their articles to get published. In the theory community we don't have the tradition of paying for our publications. On one hand this approach is much cheaper for the community but can you guarantee quality in this system? It's not obvious that one system is better than the other but personally I rather pay to read a paper than to publish it. However, I'm very curious to hear what other researchers think about this.