Probably like many of you I am quite frequently approached by publishers to submit my articles to their journal or to sign up as editor for their journals. Many of these publishers are considered to be "predatory publishers" who publish under the "open access" model to charge money from the researcher to get their work published, but who do not always conduct according to the scientific principles of a scientific field. I normally check whether these publishers appear on Beal's list (http://scholarlyoa.com/publishers/).
One notable exception on this is the series of titles in "Frontiers in.... " (fill in your field on the dots). I'm a bit uncertain whether I should respond to their requests and whether it's genuinly about the sience, or about the money making. Any experiences that would be shared are welcome.