Second, does anyone really care? Has anyone spent more than half a second looking at a generic picture on an unrelated article? Does the generic hoodie hacker look good on security articles? Or the earth with pretty links on a networking article? Or the overdone handshake on a deal article? They feel equally as cheap and more importantly equally unimportant. It's a placeholder that noone should really care about.
Third, what's the value of having human beings spend time on an image that's just there to fill space? I kinda get the argument for company identity and things that matter, but filler for an article? Nah, that's exactly where we shouldn't be spending human resources, IMO.