You said that people could do a thing. I'm asking why they would.
Academic fraud is done to boost the reputation of the academic. There isn't a lot of point in academic fraud with one paper on each of 50 fake names.
Ahhhh, that makes more sense. Academic fraud may not always be used to boost the reputation of an academic, it could boost the reputation of a science/technique/medicine. If you see 30 authors with 1,000s of citations saying x is superior and 3 authors saying y is superior, from a quick glance x seems a lot better.