that's the way the majority of Journals operate, most don't care that the author will hand out electronic copies to anyone who asks, many will post it on their university's web site.
Actually, the publishers DO care about generating income from their copyright, and for instance require extra subscription fees from universities in order for students to be allowed to copy articles that they already have access to. I'm repeatedly warned that my University could be fined if I copy a figure from a paper into my lecture slides and then "publish" them by distributing them to my students.
Academic publishing is a two way street the academics and journals need each other because "publish or perish" applies to both sides.
Academics do need to publish but they don't need commercial publishers to do so. There's a growing movement against the traditional journals - fuelled by the extortionate fees required for electronic access to the catalogue of publishing houses such as Springer and Elsevier. Universities cannot function without access to the literature, and this is your tax dollar being funnelled into the pockets of the publishers.
sure subscriptions are expensive compared to (say) people magazine, but if you pay peanuts for a job then only monkeys are going to apply.
The people who do the hard work behind the articles - the authors, the editors, and the reviewers - are not paid by the journal. The only paid staff are administrators and copy editors, who in my experience introduce more mistakes into the text than they correct.