You must be joking. There is a lot in the line for an academic journal and its website. First one need an submission and review system, after a paper accepted there is proofreading and art department, and editors also need to decide whether to invite someone write a commentary on which paper, and subsequent comment and response section if a paper raise questions/interest, then billing department and production for the physical magazines who also handle the preprints(EDIT: should be "reprints"). Finally the website platform which keeps all those digital versions of current and previous publications. I am just talking about this from an end user point of view, and I believe there are other things behind curtain we are not familiar such as deciding the future directions of a journal, writing press release, etc. Also journals do promote themselves, which inevitable incur costs.