There area also a lot of people naive to how BS publishing has become. Plenty of PhD students get sucked in, a common one is being asked to publish your thesis as a book. Learning hubris comes before an embarrassment is a right of passage to the vast majority of people who think anyone really wants to read their thesis in a bound form from a third rate publisher created last year.
In some arts/humanities subjects publishing a book is equivalent to publishing papers. These publishers are filling the same gap as the lower quality pay to publish journals.
