The conferences are realy of a very low quality and they publish everything as it is submitted in their conference proceedings. The owner is a greek that is currently a professor in the technical university of Sofia, Bulgaria (therefore the conference tax for bulgarians, greeks, romanians sometimes is much lower). The conferences are bad, but for us it is sometimes a chance to meet colegues.
As for the journals- they do not require aditional fee to publish the extended paper in their journal. They do not require a processing charges even if You submit a paper to some of their journals without any participation at one of the conferences. And yes the journals are weak, but indexed by Scopus:
http://www.scimagojr.com/journalsearch.php?q=World%20Scientific%20and%20Engineering%20Academy%20and%20Society&tip=pub
and some of their journals (a significant part) are with impact factor as well. As you can imagine during promotion procedures these are classified as a totaly legitimate publications in impact factor journal …
I cannot recommend to anyone to publish there, but I can understand the people that are doing it. After all if both Scopus and WOK think that these are legitimate journals I am afraid, that no one will hear the recommedations …
And the conferences of WSEAS are predatory, however the journals do not require payments and there is a real peer review process (as You can imagine not so strict but still real).
