But if you're going to write an article on say quantum computing or confocal microscopy, to name random things, you are going to need outside references to experimental work, history, best practices, open debates, etc. And that is usually where the errors slip in, how many people actually check the sources properly?
They're also usually pretty terrible when it comes to modern science things, but I suppose that can be attributed to a small group of people actually knowing about those things in the first place.
It used to be that the reader, as someone who needs reliable information in a field, payed a journal so that the people could work for guaranteeing the quality of the articles. Now the authors pay the journals to rubber stamp their articles with an often cargo-culted peer review, so that they can keep receiving grants.
I am all for giving free access to information; but if you want reliable information in a competitive field such as academia, where people have all incentives to cut corners, cook data, embellish results etc., you have to pay someone to do it.
This is not true, $5k is a lot of money. It is certainly more than what traveling to a conference cost! I'm in France, and even going to California for a week, including plane tickets, accommodation, food, and conference registration is less than $5k. The thing is we are sometimes told to target journals rather than conferences because "there is no more budget this year" for instance. If we had to pay $5k to publish in journals we would just be told not to publish in these journals.
What you describe appears to be the opt-in open-access option provided by commercial academic publishers such as Springer or Elsevier. If you ask me, this option is probably there so that they can say they accommodate open access; they don't really expect many researchers to pay them.